UWP Shadow

[JuandreG]

Hello again.

I have 2 questions about shadows.

1: Why is the shadows that are casted on the inside of the model displayed on the outside too? How would I go about fixing this?

Inside:

Outside:

2: How can I get the shadow to be smooth and not show the stripes that it is showing?

This is how I create the ShadowMap3D:

var shadow = new ShadowMap3D(); shadow.AutoCoverCompleteScene = true; shadow.Intensity = 0.3; shadow.IsSceneDynamic = true;

Then I add the shadow.SceneNode to a SceneNodeGroupModel3D.

[holance]

You probably want to adjust the shadow bias to reduce the stripes.

[JuandreG]

I removed the packages from my project and reinstalled them but the shadows are still showing on the back of the objects.

Maybe I'm doing something wrong, did I update the packages correctly? I just uninstalled them then reinstalled them.

I'm also using 2 directional lights, can tis cause issues?

[holance]

Is the model single layer or double layer? Could you provide the model for us to do the test?

[JuandreG]

I can send you a model yes. Can I send it to [email protected]?

[holance]

You can upload in this issue or send to my email [email protected].

[JuandreG]

I sent the file via email. Was not able to upload it here.

[holance]

I am not able to reproduce the issue with your model. Could you provide your light setup?
One side with shadow.

Other side without shadow.

[JuandreG]

Here are the lights I add. I add the to SceneNodeGroupModel3D.

var light1 = new DirectionalLight3D(); light1.Direction = new SharpDX.Vector3(-213, -266, -308); light1.Color = Windows.UI.Colors.White; GroupModel.AddNode(light1.SceneNode);

var light2 = new DirectionalLight3D(); light2.Direction = new SharpDX.Vector3(213, 266, 308); light2.Color = Windows.UI.Colors.White; GroupModel.AddNode(light2.SceneNode);
If I remove light2 then the view is too dark on the one side. The model has PBR Material so AmbientLight is too bright.

This is how I open the model before adding it to SceneNodeGroupModel3D.

`using (var assimpContext = new AssimpContext())
{
var group = new SceneNodeGroupModel3D();

                using (var stream = new MemoryStream())
                {
                    await stream.WriteAsync(bytes, 0, bytes.Length);
                    stream.Seek(0, SeekOrigin.Begin);

                    var assimpScene = assimpContext.ImportFileFromStream(stream, "glb");

                    using (var importer = new Importer())
                    {
                        importer.ToHelixToolkitScene(assimpScene, out HelixToolkitScene helixScene);

                        if (helixScene != null)
                        {
                            var matrix = new SharpDX.Matrix();
                            matrix = helixScene.Root.ModelMatrix;
                            matrix.ScaleVector = new SharpDX.Vector3(100, 100, 100);

                            helixScene.Root.ModelMatrix = matrix;
                        }

                        foreach (var item in helixScene.Root.Traverse())
                        {
                            if (item is MeshNode m)
                            {
                                m.IsThrowingShadow = true;
                                m.IsMSAAEnabled = true;
                                m.CullMode = SharpDX.Direct3D11.CullMode.Back;

                                (m.Material as PBRMaterialCore).RenderShadowMap = true;
                                (m.Material as PBRMaterialCore).MetallicFactor = 0.3f;
                                (m.Material as PBRMaterialCore).AmbientOcclusionFactor = 2.5f;
                                (m.Material as PBRMaterialCore).ReflectanceFactor = 0.8f;
                                (m.Material as PBRMaterialCore).EnableAutoTangent = true;
                                (m.Material as PBRMaterialCore).RenderIrradianceMap = true;
                                (m.Material as PBRMaterialCore).RenderNormalMap = false;
                                (m.Material as PBRMaterialCore).RenderEnvironmentMap = false;
                                (m.Material as PBRMaterialCore).RenderAmbientOcclusionMap = true;
                                (m.Material as PBRMaterialCore).RenderAlbedoMap = true;
                                (m.Material as PBRMaterialCore).RenderRoughnessMetallicMap = true;
                                (m.Material as PBRMaterialCore).RoughnessFactor = 0.3f;
                                (m.Material as PBRMaterialCore).ClearCoatRoughness = 0.5f;
                                (m.Material as PBRMaterialCore).ClearCoatStrength = 2.0f;
                            }
                        }

                        group.AddNode(helixScene.Root);
                    }
                }

                return group;
            }`

Thank you for your help.

[JuandreG]

This is what the model looks like when I open it:

[holance]

Which version are you using?

[JuandreG]

I'm using v2.18.0. "Date Published: Sunday, September 5, 2021". But after your fix #1652 I did remove all my packages and reinstalled them from nuget.

[holance]

You need to install nightly build, the fix is not in 2.18.0

[JuandreG]

I installed the nightly build but still the same problem. I installed from https://www.myget.org/F/helix-toolkit v2.19.0-revert-1634-win-0001.

I tested with the models of the pictures on this issue and they all look the same. No difference. Maybe you can show me your light setup and Viewport3DX setup? I can then test and see if the problem still exists.

[holance]

The latest nightly build is 2.19.0-alpha.36

[JuandreG]

Works perfectly with that version. Thank you very much.