void ExportMesh(Scene scene, GameObject go, ExportPlan exportPlan)
{
MeshFilter mf = go.GetComponent <MeshFilter>();
Mesh mesh = mf.mesh;
bool unvarying = scene.Time == null;
if (unvarying)
{
// Only export the mesh topology on the first frame.
var sample = (MeshSample)exportPlan.sample;
sample.transform = GetLocalTransformMatrix(go.transform);
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change of
// basis is required. There are shortcuts, but this is fully general.
sample.ConvertTransform();
sample.normals = mesh.normals;
sample.points = mesh.vertices;
sample.tangents = mesh.tangents;
sample.extent = mesh.bounds;
sample.colors = mesh.colors;
if (sample.colors != null && sample.colors.Length != sample.points.Length)
{
sample.colors = null;
}
// Set face vertex counts and indices.
sample.SetTriangles(mesh.triangles);
scene.Write(exportPlan.path, sample);
var mr = go.GetComponent <MeshRenderer>();
string usdMaterialPath;
if (!m_materialMap.TryGetValue(mr.material, out usdMaterialPath))
{
Debug.LogError("Invalid material bound for: " + exportPlan.path);
}
else
{
MaterialSample.Bind(scene, exportPlan.path, usdMaterialPath);
}
}
else
{
var sample = new XformSample();
sample.transform = GetLocalTransformMatrix(go.transform);
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change of
// basis is required. There are shortcuts, but this is fully general.
sample.ConvertTransform();
scene.Write(exportPlan.path, sample);
}
// On all other frames, we just export the mesh transform data.
// TODO(jcowles): cant currently do this because the USD prim typeName is overwritten.
//ExportXform(scene, go, exportPlan, unvarying: false);
}
void ExportXform(Scene scene, GameObject go, ExportPlan exportPlan)
{
XformSample sample = (XformSample)exportPlan.sample;
sample.transform = GetLocalTransformMatrix(go.transform);
// Unity uses a forward vector that matches DirectX, but USD matches OpenGL, so a change of
// basis is required. There are shortcuts, but this is fully general.
sample.ConvertTransform();
scene.Write(exportPlan.path, sample);
}