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render_hair_msnn.cu
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render_hair_msnn.cu
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// ======================================================================== //
// Copyright (c) Meta Platforms, Inc. and affiliates. //
// //
// This source code is licensed under the MIT license found in the //
// LICENSE file in the root directory of this source tree. //
// ======================================================================== //
#include "render_hair_msnn.h"
#include "utils.cuh"
// ====================================================
// Custom functions
// ====================================================
vec3f RenderWindow_HairMSNN::getSceneCg()
{
return (this->minBound + this->maxBound) / 2.f;
}
void RenderWindow_HairMSNN::setRenderComponents()
{
owlParamsSet1i(this->launchParams, "beta", this->beta);
}
void RenderWindow_HairMSNN::resetNetwork()
{
this->mlp->reset();
}
void RenderWindow_HairMSNN::setNRCTrain(bool train)
{
this->currentScene.nrcTrain = train;
}
void RenderWindow_HairMSNN::fetchSceneSamples()
{
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine generator(seed);
this->sampledPoints.clear();
this->sampledSurfaceVector.clear();
this->sampledParams.clear();
this->omegaSamples.clear();
// Sample Hair
float totalCurveLength = this->totalSegmentsLength;
for (auto segIdx : this->currentScene.hairModel.segmentIndices) {
float segLength = this->segmentLengths[segIdx];
int numSegSamples = int(segLength / totalCurveLength * this->numSamples);
numSegSamples = numSegSamples == 0 ? 1 : numSegSamples;
vec4f controlPoints[4];
controlPoints[0] = vec4f(this->currentScene.hairModel.controlPoints[segIdx + 0],
this->currentScene.hairModel.widths[segIdx + 0]);
controlPoints[1] = vec4f(this->currentScene.hairModel.controlPoints[segIdx + 1],
this->currentScene.hairModel.widths[segIdx + 1]);
controlPoints[2] = vec4f(this->currentScene.hairModel.controlPoints[segIdx + 2],
this->currentScene.hairModel.widths[segIdx + 2]);
controlPoints[3] = vec4f(this->currentScene.hairModel.controlPoints[segIdx + 3],
this->currentScene.hairModel.widths[segIdx + 3]);
CubicInterpolator interpolator;
interpolator.initializeFromCatrom(controlPoints);
for (int s = 0; s < numSegSamples; s++) {
float eps1 = std::generate_canonical<float, std::numeric_limits<float>::digits>(generator);
vec3f point = interpolator.position3(eps1);
vec3f tangent = curveTangent(interpolator, eps1);
float radius = interpolator.radius(eps1);
this->sampledPoints.push_back(point);
this->sampledSurfaceVector.push_back(vec4f(tangent, radius));
this->sampledParams.push_back(vec4f(0.f));
}
}
this->numSamples = this->sampledPoints.size();
// Generate omega buffer
for (int i = 0; i < this->numSamples; i++) {
float eps1 = std::generate_canonical<float, std::numeric_limits<float>::digits>(generator);
float eps2 = std::generate_canonical<float, std::numeric_limits<float>::digits>(generator);
vec3f omega = uniformSampleSphere(vec2f(eps1, eps2));
this->omegaSamples.push_back(omega);
}
// Generate device buffers
this->omegaSamplesBuf = owlDeviceBufferCreate(context,
OWL_FLOAT, this->omegaSamples.size(), this->omegaSamples.data());
this->sampledPointsBuf = owlDeviceBufferCreate(context,
OWL_FLOAT3, this->numSamples, this->sampledPoints.data());
this->sampledSurfaceVectorBuf = owlDeviceBufferCreate(context,
OWL_FLOAT4, this->numSamples, this->sampledSurfaceVector.data());
this->sampledParamsBuf = owlDeviceBufferCreate(context,
OWL_FLOAT4, this->numSamples, this->sampledParams.data());
}
void RenderWindow_HairMSNN::initialize()
{
vec2i frameRes(this->getWindowSize().x, this->getWindowSize().y);
int frameSize = frameRes.x * frameRes.y;
// ====================================================
// Setup NRC variables & buffers
// ====================================================
this->everyNth = std::ceil(frameSize / this->numTrainRecords);
this->mlp = new TINY_MLP(this->currentScene.nrcConfig, this->mlpInputCh, this->mlpOutputCh);
if (this->currentScene.nrcWeights != "")
this->mlp->loadWeights(this->currentScene.nrcWeights);
this->nnFrameInput = owlDeviceBufferCreate(context, OWL_FLOAT,
frameSize * this->mlpInputCh, nullptr);
this->nnFrameOutput = owlDeviceBufferCreate(context, OWL_FLOAT,
frameSize * this->mlpOutputCh, nullptr);
this->nnTrainInput = owlDeviceBufferCreate(context, OWL_FLOAT,
this->numTrainRecords * this->mlpInputCh, nullptr);
this->nnTrainOutput = owlDeviceBufferCreate(context, OWL_FLOAT,
this->numTrainRecords * this->mlpOutputCh, nullptr);
this->gBuffer = owlDeviceBufferCreate(context, OWL_USER_TYPE(GBuffer),
frameSize, nullptr);
// Training indices ; fill with regular grid.
// Shuffle each frame take random pixels as training data
{
int* idxs = (int*)malloc(this->numTrainRecords * sizeof(int));
thrust::sequence(thrust::host, idxs, idxs + this->numTrainRecords, 0);
this->trainIdxs = owlDeviceBufferCreate(context, OWL_INT, this->numTrainRecords, idxs);
free(idxs);
}
// Accumulation buffer stores the non-averaged radiance in float32
// Float buffer stores the averaged radiance in float32
// Frame buffer (defined in OWL::Viewer) stores averaged radiance in uint8
cudaMalloc(&this->ptAccumBuffer, frameSize * sizeof(float4));
cudaMalloc(&this->nnAccumBuffer, frameSize * sizeof(float4));
cudaMalloc(&this->finalAccumBuffer, frameSize * sizeof(float4));
cudaMalloc(&this->ptAverageBuffer, frameSize * sizeof(float4));
cudaMalloc(&this->nnAverageBuffer, frameSize * sizeof(float4));
cudaMalloc(&this->finalAverageBuffer, frameSize * sizeof(float4));
// ====================================================
// Environment lights setup
// ====================================================
if (this->currentScene.hasEnvLight) {
int resx = this->currentScene.env.resolution.x;
int resy = this->currentScene.env.resolution.y;
vec2i resolution(resx, resy);
float* envMap = this->currentScene.env.pixel_float;
float* cPdf;
float* cCdf;
float* mPdf;
float* mCdf;
generateEnvSamplingTables(resolution, envMap, &cPdf, &cCdf, &mPdf, &mCdf);
this->envTextureBuffer = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_RGBA32F,
resx, resy,
envMap,
OWL_TEXTURE_LINEAR,
OWL_TEXTURE_CLAMP);
this->envWidth = resx;
this->envHeight = resy;
this->conditionalPdf = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_R32F,
resx + 1, resy,
cPdf,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_CLAMP);
this->conditionalCdf = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_R32F,
resx + 1, resy,
cCdf,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_CLAMP);
this->marginalPdf = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_R32F,
resy + 1, 1.f,
mPdf,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_CLAMP);
this->marginalCdf = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_R32F,
resy + 1, 1.f,
mCdf,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_CLAMP);
free(cPdf); free(cCdf); free(mPdf); free(mCdf);
}
// ====================================================
// Directional lights setup
// ====================================================
this->num_dlights = this->currentScene.dLightFrom.size();
for (int i = 0; i < num_dlights; i++) {
DirectionalLight dLight;
dLight.from = this->currentScene.dLightFrom[i];
dLight.emit = this->currentScene.dLightEmit[i];
this->dLightList.push_back(dLight);
}
this->dLightsBuffer = owlDeviceBufferCreate(context,
OWL_USER_TYPE(DirectionalLight), this->dLightList.size(), this->dLightList.data());
// ====================================================
// Vector of bottom level accel. structures (BLAS)
// This is then used to build the top level accel. structure (TLAS)
// ====================================================
std::vector<OWLGroup> blasList;
// ====================================================
// Surface geometry and data setup
// ====================================================
if (this->currentScene.has_surface) {
auto surface = this->currentScene.surface;
for (auto mesh : surface->meshes) {
OWLVarDecl triangleGeomVars[] = {
{"vertex", OWL_BUFPTR, OWL_OFFSETOF(TriangleMeshData, vertex)},
{"normal", OWL_BUFPTR, OWL_OFFSETOF(TriangleMeshData, normal)},
{"index", OWL_BUFPTR, OWL_OFFSETOF(TriangleMeshData, index)},
{"texCoord", OWL_BUFPTR, OWL_OFFSETOF(TriangleMeshData, texCoord)},
{"diffuse", OWL_FLOAT3, OWL_OFFSETOF(TriangleMeshData, diffuse)},
{"diffuse_texture", OWL_TEXTURE, OWL_OFFSETOF(TriangleMeshData, diffuse_texture)},
{"hasDiffuseTexture", OWL_BOOL, OWL_OFFSETOF(TriangleMeshData, hasDiffuseTexture)},
{"alpha", OWL_FLOAT, OWL_OFFSETOF(TriangleMeshData, alpha)},
{"alpha_texture", OWL_TEXTURE, OWL_OFFSETOF(TriangleMeshData, alpha_texture)},
{"hasAlphaTexture", OWL_BOOL, OWL_OFFSETOF(TriangleMeshData, hasAlphaTexture)},
{nullptr}
};
OWLGeomType triangleGeomType = owlGeomTypeCreate(context,
OWL_GEOM_TRIANGLES,
sizeof(TriangleMeshData),
triangleGeomVars,
-1);
owlGeomTypeSetClosestHit(triangleGeomType, RADIANCE_RAY_TYPE, module, "triangleMeshCH");
owlGeomTypeSetAnyHit(triangleGeomType, SHADOW_RAY_TYPE, module, "triangleMeshAHShadow");
owlGeomTypeSetAnyHit(triangleGeomType, MULTISCATTER_RAY_TYPE, module, "triangleMeshAHMultiScatter");
OWLGeom triangleGeom = owlGeomCreate(context, triangleGeomType);
OWLBuffer vertexBuffer = owlDeviceBufferCreate(context, OWL_FLOAT3, mesh->vertex.size(), mesh->vertex.data());
OWLBuffer vertexBuffer2 = owlDeviceBufferCreate(context, OWL_FLOAT3, mesh->vertex.size(), mesh->vertex.data());
OWLBuffer normalBuffer = owlDeviceBufferCreate(context, OWL_FLOAT3, mesh->normal.size(), mesh->normal.data());
OWLBuffer indexBuffer = owlDeviceBufferCreate(context, OWL_INT3, mesh->index.size(), mesh->index.data());
OWLBuffer texCoordBuffer = owlDeviceBufferCreate(context, OWL_FLOAT2, mesh->texcoord.size(), mesh->texcoord.data());
// Create CUDA buffers and upload them for diffuse and alpha textures
if (mesh->diffuseTextureID != -1) {
Texture* diffuseTexture = surface->textures[mesh->diffuseTextureID];
OWLTexture diffuseTextureBuffer = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_RGBA8,
diffuseTexture->resolution.x,
diffuseTexture->resolution.y,
diffuseTexture->pixel,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_MIRROR);
owlGeomSetTexture(triangleGeom, "diffuse_texture", diffuseTextureBuffer);
owlGeomSet1b(triangleGeom, "hasDiffuseTexture", true);
}
else {
owlGeomSet3f(triangleGeom, "diffuse", owl3f{ mesh->diffuse.x, mesh->diffuse.y, mesh->diffuse.z });
owlGeomSet1b(triangleGeom, "hasDiffuseTexture", false);
}
if (mesh->alphaTextureID != -1) {
Texture* alphaTexture = surface->textures[mesh->alphaTextureID];
OWLTexture alphaTextureBuffer = owlTexture2DCreate(context,
OWL_TEXEL_FORMAT_RGBA8,
alphaTexture->resolution.x,
alphaTexture->resolution.y,
alphaTexture->pixel,
OWL_TEXTURE_NEAREST,
OWL_TEXTURE_MIRROR);
owlGeomSetTexture(triangleGeom, "alpha_texture", alphaTextureBuffer);
owlGeomSet1b(triangleGeom, "hasAlphaTexture", true);
}
else {
owlGeomSet1f(triangleGeom, "alpha", mesh->alpha);
owlGeomSet1b(triangleGeom, "hasAlphaTexture", false);
}
owlTrianglesSetVertices(triangleGeom, vertexBuffer,
mesh->vertex.size(), sizeof(vec3f), 0);
owlTrianglesSetIndices(triangleGeom, indexBuffer,
mesh->index.size(), sizeof(vec3i), 0);
owlGeomSetBuffer(triangleGeom, "vertex", vertexBuffer2);
owlGeomSetBuffer(triangleGeom, "normal", normalBuffer);
owlGeomSetBuffer(triangleGeom, "index", indexBuffer);
owlGeomSetBuffer(triangleGeom, "texCoord", texCoordBuffer);
OWLGroup triangleGroup = owlTrianglesGeomGroupCreate(context, 1, &triangleGeom);
owlGroupBuildAccel(triangleGroup);
this->minBound = min(this->minBound, mesh->minBound);
this->maxBound = max(this->maxBound, mesh->maxBound);
// Add to a list, which is later used to build the IAS (TLAS)
blasList.push_back(triangleGroup);
}
this->sceneScale = length(this->maxBound - this->minBound);
}
// ====================================================
// Build the TLAS (IAS) only for surfaces
// ====================================================
this->bvhSurfaces = owlInstanceGroupCreate(context,
blasList.size(), blasList.data());
owlGroupBuildAccel(bvhSurfaces);
// ====================================================
// Hair setup (geometry and BSDF)
// ====================================================
OWLVarDecl hairGeomVars[] = {
{nullptr}
};
OWLGeomType hairGeomType = owlGeomTypeCreate(context,
OWL_GEOMETRY_CURVES,
sizeof(HairData),
hairGeomVars,
-1);
owlGeomTypeSetClosestHit(hairGeomType, RADIANCE_RAY_TYPE, module, "hairCH");
owlGeomTypeSetAnyHit(hairGeomType, SHADOW_RAY_TYPE, module, "hairAHShadow");
owlGeomTypeSetAnyHit(hairGeomType, MULTISCATTER_RAY_TYPE, module, "hairAHMultiScatter");
owlCurvesSetDegree(hairGeomType, 3, false);
// ====================================================
// Data setup (hair strands from .hair file)
// ====================================================
this->hairGeom = owlGeomCreate(context, hairGeomType);
if (this->currentScene.has_hair) {
this->minBound = min(this->currentScene.hairModel.minBound, minBound);
this->maxBound = max(this->currentScene.hairModel.maxBound, maxBound);
this->sceneScale = std::max(this->currentScene.hairModel.scale, this->sceneScale);
for (auto idx : this->currentScene.hairModel.segmentIndices) {
vec3f p1 = this->currentScene.hairModel.controlPoints[idx];
vec3f p2 = this->currentScene.hairModel.controlPoints[idx + 1];
vec3f p3 = this->currentScene.hairModel.controlPoints[idx + 2];
vec3f p4 = this->currentScene.hairModel.controlPoints[idx + 3];
float l = length(p1 - p2) + length(p3 - p2) + length(p4 - p3);
this->totalSegmentsLength += l;
this->segmentLengths.push_back(l);
}
OWLBuffer cpBuffer = owlDeviceBufferCreate(context, OWL_FLOAT3,
this->currentScene.hairModel.controlPoints.size(), this->currentScene.hairModel.controlPoints.data());
OWLBuffer widthsBuffer = owlDeviceBufferCreate(context, OWL_FLOAT,
this->currentScene.hairModel.widths.size(), this->currentScene.hairModel.widths.data());
OWLBuffer indicesBuffer = owlDeviceBufferCreate(context, OWL_INT,
this->currentScene.hairModel.segmentIndices.size(), this->currentScene.hairModel.segmentIndices.data());
owlCurvesSetControlPoints(this->hairGeom, this->currentScene.hairModel.controlPoints.size(), cpBuffer, widthsBuffer);
owlCurvesSetSegmentIndices(this->hairGeom, this->currentScene.hairModel.segmentIndices.size(), indicesBuffer);
OWLGroup hairGroup = owlCurvesGeomGroupCreate(context, 1, &this->hairGeom);
owlGroupBuildAccel(hairGroup);
blasList.push_back(hairGroup);
}
// ====================================================
// Randomly sample hair strands
// ====================================================
this->fetchSceneSamples();
// ====================================================
// Sampling indices
// ====================================================
{
int* idxs = (int*)malloc(this->numSamples * sizeof(int));
thrust::sequence(thrust::host, idxs, idxs + this->numSamples, 0);
thrust::shuffle(idxs, idxs + this->numSamples, thrust::random::default_random_engine());
this->sceneIndicesBuf = owlDeviceBufferCreate(context,
OWL_INT, this->numSamples, idxs);
thrust::shuffle(idxs, idxs + this->numSamples, thrust::random::default_random_engine());
this->omegaIndicesBuf = owlDeviceBufferCreate(context,
OWL_INT, this->numSamples, idxs);
free(idxs);
}
// ====================================================
// Build the TLAS (IAS)
// ====================================================
world = owlInstanceGroupCreate(context, blasList.size(), blasList.data());
owlGroupBuildAccel(world);
// ====================================================
// Launch Parameters setup
// ====================================================
OWLVarDecl launchParamsDecl[] = {
// Debug
{"beta", OWL_INT, OWL_OFFSETOF(LaunchParams, beta)},
// NRC variables declaration
{"pass", OWL_INT, OWL_OFFSETOF(LaunchParams, pass)},
{"gBuffer", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, gBuffer)},
{"trainIdxs", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, trainIdxs)},
{"everyNth", OWL_INT, OWL_OFFSETOF(LaunchParams, everyNth)},
{"nnFrameInput", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, nnFrameInput)},
{"nnFrameOutput", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, nnFrameOutput)},
{"nnTrainInput", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, nnTrainInput)},
{"nnTrainOutput", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, nnTrainOutput)},
{"mlpInputCh", OWL_INT, OWL_OFFSETOF(LaunchParams, mlpInputCh)},
{"mlpOutputCh", OWL_INT, OWL_OFFSETOF(LaunchParams, mlpOutputCh)},
{"pathV1", OWL_INT, OWL_OFFSETOF(LaunchParams, pathV1)},
{"pathV2", OWL_INT, OWL_OFFSETOF(LaunchParams, pathV2)},
{"sampledPoints", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, sampledPoints)},
{"sampledSurfaceVector", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, sampledSurfaceVector)},
{"sampledParams", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, sampledParams)},
{"sceneIndices", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, sceneIndices)},
{"omegaSamples", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, omegaSamples)},
{"omegaIndices", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, omegaIndices)},
{"numSamples", OWL_INT, OWL_OFFSETOF(LaunchParams, numSamples)},
{"numTrainRecordsX", OWL_INT, OWL_OFFSETOF(LaunchParams, numTrainRecordsX)},
{"numTrainRecordsY", OWL_INT, OWL_OFFSETOF(LaunchParams, numTrainRecordsY)},
// Environment light parametsrs
{"envRotPhi", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, envRotPhi)},
{"envScale", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, envScale)},
{"hasEnvLight", OWL_BOOL, OWL_OFFSETOF(LaunchParams, hasEnvLight)},
{"env", OWL_TEXTURE, OWL_OFFSETOF(LaunchParams, env)},
{"envWidth", OWL_INT, OWL_OFFSETOF(LaunchParams, envWidth)},
{"envHeight", OWL_INT, OWL_OFFSETOF(LaunchParams, envHeight)},
// Environment light PDF & CDF
{"conditionalPdf", OWL_TEXTURE, OWL_OFFSETOF(LaunchParams, conditionalPdf)},
{"conditionalCdf", OWL_TEXTURE, OWL_OFFSETOF(LaunchParams, conditionalCdf)},
{"marginalPdf", OWL_TEXTURE, OWL_OFFSETOF(LaunchParams, marginalPdf)},
{"marginalCdf", OWL_TEXTURE, OWL_OFFSETOF(LaunchParams, marginalCdf)},
// Directional light parameters
{"hasDirectionalLights", OWL_BOOL, OWL_OFFSETOF(LaunchParams, hasDirectionalLights)},
{"dLights", OWL_BUFPTR, OWL_OFFSETOF(LaunchParams, dLights)},
{"num_dlights", OWL_INT, OWL_OFFSETOF(LaunchParams, num_dlights)},
// Global light parameters
{"num_total_lights", OWL_INT, OWL_OFFSETOF(LaunchParams, num_total_lights)},
// Integrator parameters
{"MIS", OWL_BOOL, OWL_OFFSETOF(LaunchParams, MIS)},
{"envPdfSampling", OWL_BOOL, OWL_OFFSETOF(LaunchParams, envPdfSampling)},
// Scene properties
{"maxBound", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, maxBound)},
{"minBound", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, minBound)},
{"sceneScale", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, sceneScale)},
// Global Hair parameters
{"sig_a", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, hairData.sig_a)},
{"beta_m", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.beta_m)},
{"beta_n", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.beta_n)},
{"alpha", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.alpha)},
{"R_G", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.R_G)},
{"TT_G", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.TT_G)},
{"TRT_G", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.TRT_G)},
{"TRRT_G", OWL_FLOAT, OWL_OFFSETOF(LaunchParams, hairData.TRRT_G)},
// All other parameters
{"ptAccumBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, ptAccumBuffer)},
{"nnAccumBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, nnAccumBuffer)},
{"finalAccumBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, finalAccumBuffer)},
{"ptAverageBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, ptAverageBuffer)},
{"nnAverageBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, nnAverageBuffer)},
{"finalAverageBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(LaunchParams, finalAverageBuffer)},
{"accumId", OWL_INT, OWL_OFFSETOF(LaunchParams, accumId)},
{"world", OWL_GROUP, OWL_OFFSETOF(LaunchParams, world)},
{"bvhSurfaces", OWL_GROUP, OWL_OFFSETOF(LaunchParams, bvhSurfaces)},
{"camera.pos", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, camera.pos)},
{"camera.dir_00", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, camera.dir_00)},
{"camera.dir_du", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, camera.dir_du)},
{"camera.dir_dv", OWL_FLOAT3, OWL_OFFSETOF(LaunchParams, camera.dir_dv)},
{nullptr}
};
this->launchParams = owlParamsCreate(context, sizeof(LaunchParams), launchParamsDecl, -1);
this->setRenderComponents();
// Global hair parameters
owlParamsSet3f(this->launchParams, "sig_a", owl3f{ this->currentScene.sig_a.x, this->currentScene.sig_a.y, this->currentScene.sig_a.z });
owlParamsSet1f(this->launchParams, "beta_m", this->currentScene.beta_m);
owlParamsSet1f(this->launchParams, "beta_n", this->currentScene.beta_n);
owlParamsSet1f(this->launchParams, "alpha", this->currentScene.alpha);
owlParamsSet1f(this->launchParams, "R_G", this->currentScene.R_G);
owlParamsSet1f(this->launchParams, "TT_G", this->currentScene.TT_G);
owlParamsSet1f(this->launchParams, "TRT_G", this->currentScene.TRT_G);
owlParamsSet1f(this->launchParams, "TRRT_G", this->currentScene.TRRT_G);
// Upload NRC variables
owlParamsSet1i(this->launchParams, "numTrainRecordsX", this->numTrainRecordsX);
owlParamsSet1i(this->launchParams, "numTrainRecordsY", this->numTrainRecordsY);
owlParamsSet1i(this->launchParams, "numSamples", this->numSamples);
owlParamsSetBuffer(this->launchParams, "trainIdxs", this->trainIdxs);
owlParamsSet1i(this->launchParams, "everyNth", this->everyNth);
owlParamsSetBuffer(this->launchParams, "sampledPoints", this->sampledPointsBuf);
owlParamsSetBuffer(this->launchParams, "sampledSurfaceVector", this->sampledSurfaceVectorBuf);
owlParamsSetBuffer(this->launchParams, "sampledParams", this->sampledParamsBuf);
owlParamsSetBuffer(this->launchParams, "sceneIndices", this->sceneIndicesBuf);
owlParamsSetBuffer(this->launchParams, "omegaSamples", this->omegaSamplesBuf);
owlParamsSetBuffer(this->launchParams, "omegaIndices", this->omegaIndicesBuf);
owlParamsSetBuffer(this->launchParams, "gBuffer", this->gBuffer);
owlParamsSetBuffer(this->launchParams, "nnFrameInput", this->nnFrameInput);
owlParamsSetBuffer(this->launchParams, "nnFrameOutput", this->nnFrameOutput);
owlParamsSetBuffer(this->launchParams, "nnTrainInput", this->nnTrainInput);
owlParamsSetBuffer(this->launchParams, "nnTrainOutput", this->nnTrainOutput);
owlParamsSet1i(this->launchParams, "mlpInputCh", this->mlpInputCh);
owlParamsSet1i(this->launchParams, "mlpOutputCh", this->mlpOutputCh);
owlParamsSet1i(this->launchParams, "pathV1", this->currentScene.path_v1);
owlParamsSet1i(this->launchParams, "pathV2", this->currentScene.path_v2);
// Upload scene properties
owlParamsSet3f(this->launchParams, "maxBound", owl3f{ this->maxBound.x, this->maxBound.y, this->maxBound.z });
owlParamsSet3f(this->launchParams, "minBound", owl3f{ this->minBound.x, this->minBound.y, this->minBound.z });
owlParamsSet1f(this->launchParams, "sceneScale", this->sceneScale);
// Upload integrator parameters
owlParamsSet1b(this->launchParams, "MIS", this->currentScene.MIS);
owlParamsSet1i(this->launchParams, "accumId", this->accumId);
owlParamsSet1ul(this->launchParams, "ptAccumBuffer", (uint64_t)this->ptAccumBuffer);
owlParamsSet1ul(this->launchParams, "nnAccumBuffer", (uint64_t)this->nnAccumBuffer);
owlParamsSet1ul(this->launchParams, "finalAccumBuffer", (uint64_t)this->finalAccumBuffer);
owlParamsSet1ul(this->launchParams, "ptAverageBuffer", (uint64_t)this->ptAverageBuffer);
owlParamsSet1ul(this->launchParams, "nnAverageBuffer", (uint64_t)this->nnAverageBuffer);
owlParamsSet1ul(this->launchParams, "finalAverageBuffer", (uint64_t)this->finalAverageBuffer);
int num_total_lights = 0;
// Upload environment light
owlParamsSet1f(this->launchParams, "envRotPhi", this->currentScene.envRotPhi);
owlParamsSet1f(this->launchParams, "envScale", this->currentScene.envScale);
owlParamsSet1i(this->launchParams, "envWidth", this->envWidth);
owlParamsSet1i(this->launchParams, "envHeight", this->envHeight);
owlParamsSet1b(this->launchParams, "envPdfSampling", this->currentScene.envPdfSampling);
owlParamsSet1b(this->launchParams, "hasEnvLight", this->currentScene.hasEnvLight);
if (this->currentScene.hasEnvLight) {
owlParamsSetTexture(this->launchParams, "env", this->envTextureBuffer);
owlParamsSetTexture(this->launchParams, "conditionalPdf", this->conditionalPdf);
owlParamsSetTexture(this->launchParams, "conditionalCdf", this->conditionalCdf);
owlParamsSetTexture(this->launchParams, "marginalPdf", this->marginalPdf);
owlParamsSetTexture(this->launchParams, "marginalCdf", this->marginalCdf);
num_total_lights += 1;
}
// Upload directional lights
owlParamsSet1b(this->launchParams, "hasDirectionalLights", this->currentScene.hasDirectionalLights);
owlParamsSetBuffer(this->launchParams, "dLights", dLightsBuffer);
owlParamsSet1i(this->launchParams, "num_dlights", num_dlights);
// Upload global light parameters
num_total_lights += num_dlights;
owlParamsSet1i(this->launchParams, "num_total_lights", num_total_lights);
// ====================================================
// Setup a generic miss program
// ====================================================
OWLVarDecl missProgVars[] = {
{"const_color", OWL_FLOAT3, OWL_OFFSETOF(MissProgData, const_color)},
{nullptr}
};
missProg = owlMissProgCreate(context, module, "miss", sizeof(MissProgData), missProgVars, -1);
// Set a constant background color in the miss program (black for now)
owlMissProgSet3f(missProg, "const_color", owl3f{ 0.f, 0.f, 0.f });
// ====================================================
// Setup a pin-hole camera ray-gen program
// ====================================================
OWLVarDecl rayGenVars[] = {
{"frameBuffer", OWL_RAW_POINTER, OWL_OFFSETOF(RayGenData, frameBuffer)},
{"frameBufferSize", OWL_INT2, OWL_OFFSETOF(RayGenData, frameBufferSize)},
{nullptr}
};
// Create regular ray gen
this->rayGen = owlRayGenCreate(context, module, "rayGenCam", sizeof(RayGenData), rayGenVars, -1);
// Set the TLAS to be used
owlParamsSetGroup(this->launchParams, "world", world);
owlParamsSetGroup(this->launchParams, "bvhSurfaces", bvhSurfaces);
// ====================================================
// Finally, build the programs, pipeline and SBT
// ====================================================
owlBuildPrograms(context);
owlBuildPipeline(context);
owlBuildSBT(context);
this->enableInspectMode(owl::box3f(this->minBound, this->maxBound));
this->setWorldScale(this->sceneScale);
// Initial 1 sec training
long long time = 0;
while (true) {
time += this->genTrainingData();
time += this->train();
if (time > 1000000)
break;
}
std::cout << "Initial training: " << (float) time / 1e6 << " sec" << std::endl;
this->cameraChanged();
}
long long RenderWindow_HairMSNN::genTrainingData()
{
auto start = std::chrono::high_resolution_clock::now();
if (sbtDirty) {
owlBuildSBT(context);
sbtDirty = false;
}
// Generate
owlParamsSet1i(this->launchParams, "accumId", this->accumId);
owlParamsSet1i(this->launchParams, "pass", TRAIN_DATA_GEN);
owlLaunch2D(this->rayGen, this->numTrainRecordsX, this->numTrainRecordsY, this->launchParams);
accumId++;
auto finish = std::chrono::high_resolution_clock::now();
return std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
long long RenderWindow_HairMSNN::train()
{
auto start = std::chrono::high_resolution_clock::now();
// Shuffle
{
int* devicePtr = (int*)owlBufferGetPointer(this->sceneIndicesBuf, 0);
thrust::device_ptr<int> thrustPtr = thrust::device_pointer_cast(devicePtr);
thrust::shuffle(thrustPtr, thrustPtr + this->numSamples, thrust::default_random_engine());
}
// Train
{
float* trainInputPtr = (float*)owlBufferGetPointer(this->nnTrainInput, 0);
float* trainGTPtr = (float*)owlBufferGetPointer(this->nnTrainOutput, 0);
GPUMatrix<float> trainInput(trainInputPtr,
this->mlpInputCh,
this->numTrainRecords);
GPUMatrix<float> trainGT(trainGTPtr,
this->mlpOutputCh,
this->numTrainRecords);
auto ctx = this->mlp->trainer->training_step(trainInput, trainGT);
this->trainingLoss = mlp->trainer->loss(*ctx);
}
auto finish = std::chrono::high_resolution_clock::now();
return std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
long long RenderWindow_HairMSNN::render()
{
auto startFull = std::chrono::high_resolution_clock::now();
if (sbtDirty) {
owlBuildSBT(context);
sbtDirty = false;
}
if (this->accumId < this->currentScene.spp || this->progressive) {
owlParamsSet1i(this->launchParams, "accumId", this->accumId);
// Shuffle, to choose random pixels as training points
int* trainIdxsPtr = (int*)owlBufferGetPointer(this->trainIdxs, 0);
thrust::device_ptr<int> thrustPtr = thrust::device_pointer_cast(trainIdxsPtr);
thrust::shuffle(thrustPtr, thrustPtr + this->numTrainRecords, thrust::default_random_engine());
// Render
{
// Render
auto start = std::chrono::high_resolution_clock::now();
owlParamsSet1i(this->launchParams, "pass", G_BUFFER);
owlLaunch2D(this->rayGen, this->fbSize.x, this->fbSize.y, this->launchParams);
auto finish = std::chrono::high_resolution_clock::now();
this->renderTime = std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
// Training
{
auto start = std::chrono::high_resolution_clock::now();
if (this->currentScene.nrcTrain) {
this->train();
}
auto finish = std::chrono::high_resolution_clock::now();
this->trainTime = std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
// Infer
{
auto start = std::chrono::high_resolution_clock::now();
{
float* networkInput = (float*)owlBufferGetPointer(this->nnFrameInput, 0);
float* networkOutput = (float*)owlBufferGetPointer(this->nnFrameOutput, 0);
this->mlp->inference(networkInput, networkOutput, this->fbSize.x * this->fbSize.y);
}
auto finish = std::chrono::high_resolution_clock::now();
this->inferTime = std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
// Render final
{
auto start = std::chrono::high_resolution_clock::now();
owlParamsSet1i(this->launchParams, "pass", RENDER);
owlLaunch2D(this->rayGen, this->fbSize.x, this->fbSize.y, this->launchParams);
auto finish = std::chrono::high_resolution_clock::now();
this->renderTime += std::chrono::duration_cast<std::chrono::microseconds>(finish - start).count();
}
accumId++;
}
auto finishFull = std::chrono::high_resolution_clock::now();
return std::chrono::duration_cast<std::chrono::microseconds>(finishFull - startFull).count();
}
void RenderWindow_HairMSNN::resize(const vec2i& newSize)
{
if (this->getWindowSize().x == 0 && this->getWindowSize().y == 0) {
OWLViewer::resize(newSize);
this->initialize();
this->cameraChanged();
}
}
void RenderWindow_HairMSNN::drawUI()
{
ImGui_ImplOpenGL2_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
{
ImGui::Begin("Controls", NULL, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
ImGui::Text("%.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
bool prog = this->progressive;
ImGui::Checkbox("Progressive", &prog);
if (prog != this->progressive) {
this->progressive = prog;
this->cameraChanged();
}
bool den = this->currentScene.denoise;
ImGui::Checkbox("Denoise", &den);
if (den != this->currentScene.denoise) {
this->currentScene.denoise = den;
this->cameraChanged();
}
if (!this->progressive) {
int currentSpp = this->currentScene.spp;
ImGui::SliderInt("SPP", ¤tSpp, 0, 100);
if (currentSpp != this->currentScene.spp) {
this->currentScene.spp = currentSpp;
this->cameraChanged();
}
}
if (ImGui::CollapsingHeader("TCNN")) {
bool train = this->currentScene.nrcTrain;
ImGui::Checkbox("Train TCNN", &train);
if (train != this->currentScene.nrcTrain) {
this->setNRCTrain(train);
}
if (ImGui::Button("Reset Network")) {
this->resetNetwork();
}
}
// Sampling controls
if (ImGui::CollapsingHeader("Sampling")) {
bool currentMIS = this->currentScene.MIS;
ImGui::Checkbox("MIS", ¤tMIS);
if (currentMIS != this->currentScene.MIS) {
this->currentScene.MIS = currentMIS;
owlParamsSet1b(this->launchParams, "MIS", currentMIS);
this->cameraChanged();
}
bool currentEnvSampling = this->currentScene.envPdfSampling;
ImGui::Checkbox("Env. PDF Samp.", ¤tEnvSampling);
if (currentEnvSampling != this->currentScene.envPdfSampling) {
this->currentScene.envPdfSampling = currentEnvSampling;
owlParamsSet1b(this->launchParams, "envPdfSampling", currentEnvSampling);
this->cameraChanged();
}
}
// All hair controls
if (ImGui::CollapsingHeader("Hair")) {
float cur_sig_a[3] = { this->currentScene.sig_a.x, this->currentScene.sig_a.y,
this->currentScene.sig_a.z };
ImGui::SliderFloat3("Sigma", cur_sig_a, 0.f, 10.f);
if (this->currentScene.sig_a.x != cur_sig_a[0] ||
this->currentScene.sig_a.y != cur_sig_a[1] ||
this->currentScene.sig_a.z != cur_sig_a[2]) {
this->currentScene.sig_a = vec3f(cur_sig_a[0], cur_sig_a[1], cur_sig_a[2]);
owlParamsSet3f(this->launchParams, "sig_a", owl3f{ cur_sig_a[0], cur_sig_a[1],
cur_sig_a[2] });
this->cameraChanged();
}
float cur_beta_m = this->currentScene.beta_m;
ImGui::SliderFloat("beta_m", &cur_beta_m, 0.f, 1.f);
if (cur_beta_m != this->currentScene.beta_m) {
this->currentScene.beta_m = cur_beta_m;
owlParamsSet1f(this->launchParams, "beta_m", cur_beta_m);
this->cameraChanged();
}
float cur_beta_n = this->currentScene.beta_n;
ImGui::SliderFloat("beta_n", &cur_beta_n, 0.f, 1.f);
if (cur_beta_n != this->currentScene.beta_n) {
this->currentScene.beta_n = cur_beta_n;
owlParamsSet1f(this->launchParams, "beta_n", cur_beta_n);
this->cameraChanged();
}
float cur_alpha = this->currentScene.alpha;
ImGui::SliderFloat("alpha", &cur_alpha, 0.f, 20.f * 3.14159f / 180.f);
if (cur_alpha != this->currentScene.alpha) {
this->currentScene.alpha = cur_alpha;
owlParamsSet1f(this->launchParams, "alpha", cur_alpha);
this->cameraChanged();
}
float rg = this->currentScene.R_G;
ImGui::SliderFloat("R Gain", &rg, 0.f, 1.f);
if (rg != this->currentScene.R_G) {
this->currentScene.R_G = rg;
owlParamsSet1f(this->launchParams, "R_G", rg);
this->cameraChanged();
}
float ttg = this->currentScene.TT_G;
ImGui::SliderFloat("TT Gain", &ttg, 0.f, 1.f);
if (ttg != this->currentScene.TT_G) {
this->currentScene.TT_G = ttg;
owlParamsSet1f(this->launchParams, "TT_G", ttg);
this->cameraChanged();
}
float trtg = this->currentScene.TRT_G;
ImGui::SliderFloat("TRT Gain", &trtg, 0.f, 1.f);
if (trtg != this->currentScene.TRT_G) {
this->currentScene.TRT_G = trtg;
owlParamsSet1f(this->launchParams, "TRT_G", trtg);
this->cameraChanged();
}
float trrtg = this->currentScene.TRRT_G;
ImGui::SliderFloat("TRRT Gain", &trrtg, 0.f, 1.f);
if (trrtg != this->currentScene.TRRT_G) {
this->currentScene.TRRT_G = trrtg;
owlParamsSet1f(this->launchParams, "TRRT_G", trrtg);
this->cameraChanged();
}
}
// All lighting controls
if (ImGui::CollapsingHeader("Light")) {
if (ImGui::TreeNode("Environment Light")) {
// Controls for environment light
if (this->currentScene.hasEnvLight) {
float scale = this->currentScene.envScale;
ImGui::SliderFloat("Radiance Scale", &scale, 0.f, 100.f);
if (scale != this->currentScene.envScale) {
this->currentScene.envScale = scale;
owlParamsSet1f(this->launchParams, "envScale", scale);
this->cameraChanged();
}
float rot = this->currentScene.envRotPhi;
ImGui::SliderFloat("Rotation", &rot, 0.f, 3.14159f * 2.f);
if (rot != this->currentScene.envRotPhi) {
this->currentScene.envRotPhi = rot;
owlParamsSet1f(this->launchParams, "envRotPhi", rot);
this->cameraChanged();
}
}
ImGui::TreePop();
}
if (ImGui::TreeNode("Directional Lights")) {
// Controls for directional lights
for (int i = 0; i < this->num_dlights; i++) {
float dLightFrom[3] = {
this->dLightList[i].from.x,
this->dLightList[i].from.y,
this->dLightList[i].from.z
};
std::string sname = "Dir " + std::to_string(i + 1);
ImGui::SliderFloat3(sname.c_str(), dLightFrom, -1.f, 1.f);
if (dLightFrom[0] != this->dLightList[i].from.x ||
dLightFrom[1] != this->dLightList[i].from.y ||
dLightFrom[2] != this->dLightList[i].from.z) {
this->dLightList[i].from = vec3f(dLightFrom[0], dLightFrom[1], dLightFrom[2]);
this->uploadLights();
}
float emit = this->dLightList[i].emit.x;
ImGui::SliderFloat("Emit", &emit, 0.f, 100.f);
if (emit != this->dLightList[i].emit.x) {
this->dLightList[i].emit = vec3f(emit);
this->uploadLights();
}
}
ImGui::TreePop();
}
}
if (ImGui::Button("Save PNG")) {
this->screenShot(this->currentScene.renderOutput);
}
if (ImGui::Button("Save EXR")) {
std::string exrFile = this->currentScene.renderOutput;
size_t pos = exrFile.find(".png");
exrFile.replace(pos, 4, ".exr");
this->screenShotEXR(exrFile);
}
ImGui::End();
}
ImGui::Render();
ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
}
// ====================================================
// Mostly constant functions
// ====================================================
void RenderWindow_HairMSNN::screenShotEXR(std::string fname)
{
int bufferSize = this->fbSize.x * this->fbSize.y * 4 * sizeof(float);