布料碰撞模拟

1、案例介绍

案例位置：examples/Cuda/CodimensionalPD/GL_ClothWithCollision

功能介绍：案例中展示了 CodimensionalPD 类的的基本使用。

案例说明：该案例主要用于模拟布料。布料在重力作用下，从空中掉落到静态球体，并形成褶皱的过程。

2、程序实现

  • 创建场景图、边界以及静态球杆模型：
	std::shared_ptr<SceneGraph> scn = std::make_shared<SceneGraph>();
	scn->setLowerBound(Vec3f(-1.5, 0, -1.5));
	scn->setUpperBound(Vec3f(1.5, 3, 1.5)); 
	
	auto object = scn->addNode(std::make_shared<StaticTriangularMesh<DataType3f>>());
	object->varFileName()->setValue(getAssetPath() + "cloth_shell/model_ball.obj");
	

	auto boundary = scn->addNode(std::make_shared<VolumeBoundary<DataType3f>>());
	boundary->loadCube(Vec3f(-1.5,0,-1.5), Vec3f(1.5,3,1.5), 0.005f, true);
	//boundary->loadShpere(Vec3f(0.5, 0.6f, 0.5), 0.15f, 0.005f, false, true); 
	boundary->loadSDF(getAssetPath() + "cloth_shell/model_sdf.sdf");
  • 创建CodimensionalPD节点，用于模拟布料：
auto cloth = scn->addNode(std::make_shared<CodimensionalPD<DataType3f>>(0.15f,2e1f,0.0f));
	cloth->loadSurface(getAssetPath() + "cloth_shell/mesh_120.obj");
	cloth->connect(boundary->importTriangularSystems()); 
	cloth->setDt(0.001f);
	cloth->setGrad_ite_eps(1e-4);
	cloth->setMaxIteNumber(10);
	cloth->setAccelerated(true);
	auto surfaceRendererCloth = std::make_shared<GLSurfaceVisualModule>();
	surfaceRendererCloth->setColor(Color(0.4,0.4,1.0));
  • 创建渲染节点：
auto surfaceRenderer = std::make_shared<GLSurfaceVisualModule>();
	surfaceRenderer->setColor(Color(0.4,0.4,0.4));
	surfaceRenderer->varUseVertexNormal()->setValue(true);
	cloth->stateTriangleSet()->connect(surfaceRendererCloth->inTriangleSet());
	object->stateTriangleSet()->connect(surfaceRenderer->inTriangleSet());
	cloth->graphicsPipeline()->pushModule(surfaceRendererCloth);
	object->graphicsPipeline()->pushModule(surfaceRenderer);
	cloth->setVisible(true);
	object->setVisible(true);