Beispiel #1
0
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);
}