void CreateTerrainGeomtry(LevelGeometry &lg)
{
const int PATCH_SIZE = 64;
if (!Terrain)
return;
PxHeightFieldGeometry g = Terrain->GetHFShape();
const float colScale = g.columnScale;
const float rowScale = g.rowScale;
const float heightScale = g.heightScale;
PxHeightField *physHF = g.heightField;
PxU32 nbCols = physHF->getNbColumns();
PxU32 nbRows = physHF->getNbRows();
PxU32 patchCols = static_cast<PxU32>(ceilf(nbCols / static_cast<float>(PATCH_SIZE)));
PxU32 patchRows = static_cast<PxU32>(ceilf(nbRows / static_cast<float>(PATCH_SIZE)));
lg.meshes.Resize(patchCols * patchRows);
lg.meshStartObjectsIdx = lg.meshes.Count();
for (PxU32 pi = 0; pi < patchCols; ++pi)
{
for (PxU32 pj = 0; pj < patchRows; ++pj)
{
// Fill patch vertices first.
LevelGeometry::Mesh &p = lg.meshes[pi * patchRows + pj];
PxU32 startCol = pi * PATCH_SIZE;
PxU32 startRow = pj * PATCH_SIZE;
PxU32 endCol = (pi + 1) * PATCH_SIZE;
PxU32 endRow = (pj + 1) * PATCH_SIZE;
PxU32 w = std::min(endCol - startCol + 1, nbCols - startCol);
PxU32 h = std::min(endRow - startRow + 1, nbRows - startRow);
p.vertices.Resize(w * h);
for(PxU32 i = 0; i < w; ++i)
{
for(PxU32 j = 0; j < h; ++j)
{
PxReal x = PxReal(i + startCol);
PxReal z = PxReal(j + startRow);
PxReal y = physHF->getHeight(x, z) * heightScale;
PxU32 idx = i * h + j;
p.vertices[idx] = r3dVector(x * colScale, y, z * rowScale);
}
}
// Now triangulate patch
const PxU32 nbFaces = (w - 1) * (h - 1) * 2;
p.indices.Resize(nbFaces * 3);
int * indices = &p.indices.GetFirst();
for (PxU32 i = 0; i < (w - 1); ++i)
{
for (PxU32 j = 0; j < (h - 1); ++j)
{
// first triangle
uint32_t baseIdx = 6 * (i * (h - 1) + j);
indices[baseIdx + 0] = (i + 1) * h + j;
indices[baseIdx + 1] = i * h + j;
indices[baseIdx + 2] = i * h + j + 1;
// second triangle
indices[baseIdx + 3] = (i + 1) * h + j + 1;
indices[baseIdx + 4] = (i + 1) * h + j;
indices[baseIdx + 5] = i * h + j + 1;
}
}
// Filter outside triangles
uint32_t indicesCount = gConvexRegionsManager.FilterOutsideTriangles(&p.vertices.GetFirst(), &p.indices.GetFirst(), p.indices.Count());
p.indices.Resize(indicesCount);
}
}
}
