void WaveFrontExporter::exportPatch(IPatch& patch)
{
_output << "\ng " << "Patch" << _exportedPatches << "\n";
std::string vertexBuf;
std::string texCoordBuf;
std::string faceBuf;
// Get hold of the fully tesselated patch mesh, not just the control vertices
PatchMesh mesh = patch.getTesselatedPatchMesh();
// Remember the vertex count offset
std::size_t firstVertex = _vertexCount;
for (std::size_t h = 0; h < mesh.height; ++h)
{
for (std::size_t w = 0; w < mesh.width; ++w)
{
const PatchMesh::Vertex& v = mesh.vertices[mesh.width*h + w];
// Write coordinates into the export buffers
vertexBuf += "v " + std::string(v.vertex) + "\n";
texCoordBuf += "vt " + std::string(v.texcoord) + "\n";
// Count the exported vertices
++_vertexCount;
// Starting from the second row, we're gathering the faces
if (h > 0 && w > 0)
{
// Gather the indices forming a quad
std::size_t v1 = 1 + firstVertex + h*mesh.width + w;
std::size_t v2 = 1 + firstVertex + (h-1)*mesh.width + w;
std::size_t v3 = 1 + firstVertex + (h-1)*mesh.width + (w-1);
std::size_t v4 = 1 + firstVertex + h*mesh.width + (w-1);
// Construct the quad
faceBuf += "f";
faceBuf += " " + sizetToStr(v1) + "/" + sizetToStr(v1);
faceBuf += " " + sizetToStr(v4) + "/" + sizetToStr(v4);
faceBuf += " " + sizetToStr(v3) + "/" + sizetToStr(v3);
faceBuf += " " + sizetToStr(v2) + "/" + sizetToStr(v2);
faceBuf += "\n";
}
}
}
_output << vertexBuf << "\n";
_output << texCoordBuf << "\n";
_output << faceBuf << "\n";
++_exportedPatches;
}
void ModelExporter::processPatch(const scene::INodePtr& node)
{
IPatch* patch = Node_getIPatch(node);
if (patch == nullptr) return;
const std::string& materialName = patch->getShader();
if (!isExportableMaterial(materialName)) return;
PatchMesh mesh = patch->getTesselatedPatchMesh();
std::vector<model::ModelPolygon> polys;
for (std::size_t h = 0; h < mesh.height - 1; ++h)
{
for (std::size_t w = 0; w < mesh.width - 1; ++w)
{
model::ModelPolygon poly;
poly.a = convertPatchVertex(mesh.vertices[w + (h*mesh.width)]);
poly.b = convertPatchVertex(mesh.vertices[w + 1 + (h*mesh.width)]);
poly.c = convertPatchVertex(mesh.vertices[w + mesh.width + (h*mesh.width)]);
polys.push_back(poly);
poly.a = convertPatchVertex(mesh.vertices[w + 1 + (h*mesh.width)]);
poly.b = convertPatchVertex(mesh.vertices[w + 1 + mesh.width + (h*mesh.width)]);
poly.c = convertPatchVertex(mesh.vertices[w + mesh.width + (h*mesh.width)]);
polys.push_back(poly);
}
}
Matrix4 exportTransform = node->localToWorld().getPremultipliedBy(_centerTransform);
_exporter->addPolygons(materialName, polys, exportTransform);
}