public override ModelContent Process(NodeContent input, ContentProcessorContext context)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
//we always want to generate tangent frames, as we use tangent space normal mapping
GenerateTangentFrames = true;
//merge transforms
MeshHelper.TransformScene(input, input.Transform);
input.Transform = Matrix.Identity;
if (!_isSkinned)
MergeTransforms(input);
ModelContent model = base.Process(input, context);
//gather some information that will be useful in run time
MeshMetadata metadata = new MeshMetadata();
BoundingBox aabb = new BoundingBox();
metadata.BoundingBox = ComputeBoundingBox(input, ref aabb, metadata);
//assign it to our Tag
model.Tag = metadata;
return model;
}
private BoundingBox ComputeBoundingBox(NodeContent input, ref BoundingBox aabb, MeshMetadata metadata)
{
BoundingBox boundingBox;
if (input is MeshContent)
{
MeshContent mc = (MeshContent)input;
MeshHelper.TransformScene(mc, mc.Transform);
mc.Transform = Matrix.Identity;
boundingBox = BoundingBox.CreateFromPoints(mc.Positions);
//create sub mesh information
MeshMetadata.SubMeshMetadata subMeshMetadata = new MeshMetadata.SubMeshMetadata();
subMeshMetadata.BoundingBox = boundingBox;
subMeshMetadata.RenderQueue = _renderQueue;
subMeshMetadata.CastShadows = CastShadows;
metadata.AddSubMeshMetadata(subMeshMetadata);
if (metadata.SubMeshesMetadata.Count > 1)
boundingBox = BoundingBox.CreateMerged(boundingBox, aabb);
}
else
{
boundingBox = aabb;
}
foreach (NodeContent c in input.Children)
{
boundingBox = BoundingBox.CreateMerged(boundingBox, ComputeBoundingBox(c, ref boundingBox, metadata));
}
return boundingBox;
}