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class Inflatable : public Scene
{
public:
Inflatable(const char* name) : Scene(name) {}
virtual ~Inflatable()
{
for (size_t i = 0; i < mCloths.size(); ++i)
delete mCloths[i];
}
void AddInflatable(const Mesh* mesh, float overPressure, int phase)
{
const int startVertex = g_buffers->positions.size();
// add mesh to system
for (size_t i = 0; i < mesh->GetNumVertices(); ++i)
{
const Vec3 p = Vec3(mesh->m_positions[i]);
g_buffers->positions.push_back(Vec4(p.x, p.y, p.z, 1.0f));
g_buffers->velocities.push_back(0.0f);
g_buffers->phases.push_back(phase);
}
int triOffset = g_buffers->triangles.size();
int triCount = mesh->GetNumFaces();
g_buffers->inflatableTriOffsets.push_back(triOffset / 3);
g_buffers->inflatableTriCounts.push_back(mesh->GetNumFaces());
g_buffers->inflatablePressures.push_back(overPressure);
for (size_t i = 0; i < mesh->m_indices.size(); i += 3)
{
int a = mesh->m_indices[i + 0];
int b = mesh->m_indices[i + 1];
int c = mesh->m_indices[i + 2];
Vec3 n = -Normalize(Cross(mesh->m_positions[b] - mesh->m_positions[a], mesh->m_positions[c] - mesh->m_positions[a]));
g_buffers->triangleNormals.push_back(n);
g_buffers->triangles.push_back(a + startVertex);
g_buffers->triangles.push_back(b + startVertex);
g_buffers->triangles.push_back(c + startVertex);
}
// create a cloth mesh using the global positions / indices
ClothMesh* cloth = new ClothMesh(&g_buffers->positions[0], g_buffers->positions.size(), &g_buffers->triangles[triOffset], triCount * 3, 0.8f, 1.0f);
for (size_t i = 0; i < cloth->mConstraintIndices.size(); ++i)
g_buffers->springIndices.push_back(cloth->mConstraintIndices[i]);
for (size_t i = 0; i < cloth->mConstraintCoefficients.size(); ++i)
g_buffers->springStiffness.push_back(cloth->mConstraintCoefficients[i]);
for (size_t i = 0; i < cloth->mConstraintRestLengths.size(); ++i)
g_buffers->springLengths.push_back(cloth->mConstraintRestLengths[i]);
mCloths.push_back(cloth);
// add inflatable params
g_buffers->inflatableVolumes.push_back(cloth->mRestVolume);
g_buffers->inflatableCoefficients.push_back(cloth->mConstraintScale);
}
void Initialize()
{
mCloths.resize(0);
float minSize = 0.75f;
float maxSize = 1.0f;
// convex rocks
for (int i = 0; i < 5; i++)
AddRandomConvex(10, Vec3(i*2.0f, 0.0f, Randf(0.0f, 2.0f)), minSize, maxSize, Vec3(0.0f, 1.0f, 0.0f), Randf(0.0f, k2Pi));
float radius = 0.12f;
int group = 0;
const char* meshes[2] =
{
"../../data/box_high_weld.ply",
"../../data/sphere.ply"
};
mPressure = 1.0f;
for (int y = 0; y < 2; ++y)
{
for (int i = 0; i < 4; ++i)
{
Mesh* mesh = ImportMesh(GetFilePathByPlatform(meshes[(i + y) & 1]).c_str());
mesh->Normalize();
mesh->Transform(TranslationMatrix(Point3(i*2.0f, 1.0f + y*2.0f, 1.5f)));
AddInflatable(mesh, mPressure, NvFlexMakePhase(group++, 0));
delete mesh;
}
}
g_params.radius = radius;
g_params.dynamicFriction = 0.4f;
g_params.dissipation = 0.0f;
g_params.numIterations = 10;
g_params.particleCollisionMargin = g_params.radius*0.05f;
g_params.drag = 0.0f;
g_params.collisionDistance = 0.01f;
// better convergence with global relaxation factor
g_params.relaxationMode = eNvFlexRelaxationGlobal;
g_params.relaxationFactor = 0.25f;
g_windStrength = 0.0f;
g_numSubsteps = 2;
// draw options
g_drawPoints = false;
g_drawSprings = 0;
g_drawCloth = false;
}
virtual void DoGui()
{
if (imguiSlider("Over Pressure", &mPressure, 0.25f, 3.0f, 0.001f))
{
for (int i = 0; i < int(g_buffers->inflatablePressures.size()); ++i)
g_buffers->inflatablePressures[i] = mPressure;
}
}
virtual void Sync()
{
NvFlexSetInflatables(g_solver, g_buffers->inflatableTriOffsets.buffer, g_buffers->inflatableTriCounts.buffer, g_buffers->inflatableVolumes.buffer, g_buffers->inflatablePressures.buffer, g_buffers->inflatableCoefficients.buffer, mCloths.size());
}
virtual void Draw(int pass)
{
if (!g_drawMesh)
return;
int indexStart = 0;
for (size_t i = 0; i < mCloths.size(); ++i)
{
DrawCloth(&g_buffers->positions[0], &g_buffers->normals[0], NULL, &g_buffers->triangles[indexStart], mCloths[i]->mTris.size(), g_buffers->positions.size(), i % 6, g_params.radius*0.35f);
indexStart += mCloths[i]->mTris.size() * 3;
}
}
float mPressure;
std::vector<ClothMesh*> mCloths;
};
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