fix bugs in arealight scene

README.md

@@ -41,6 +41,7 @@ Moer-lite的框架基于Moer主干：https://github.com/NJUCG/Moer .
  - bool OctreeAcceleration::rayIntersect
  - 增加了`examples/lab1-test0`测试场景，用于测试加速结构的效率
  - 目前可以修改配置文件中scene的acceleration参数用来测试不同的加速结构，现在可选的参数有`embree`（default）、`linear`（没有任何求交加速）、`octree`（需要实现）
+ - 修改了面光源存在时运行发生段错误
 
 ## TODO
 - 对mesh和sphere实现表面采样（目前只有parallelogram可以配置为面光源）

src/FunctionLayer/Scene/Scene.cpp

@@ -12,10 +12,11 @@ Scene::Scene(const Json &json) {
  acceleration = Acceleration::createAcceleration();
 
  //* 添加几何体
+ int geomID = 0;
  auto shapes = json["shapes"];
  for (int i = 0; i < shapes.size(); ++i) {
  auto shape = Factory::construct_class<Shape>(shapes[i]);
- shape->geometryID = i;
+ shape->geometryID = geomID++;
  acceleration->attachShape(shape);
  }
  //* 添加光源
@@ -34,6 +35,7 @@ Scene::Scene(const Json &json) {
  if (light->type == LightType::AreaLight) {
  auto shape = std::static_pointer_cast<AreaLight>(light)->shape;
  shape->light = light;
+ shape->geometryID = geomID++;
  acceleration->attachShape(shape);
  }
  }