// TODO: Find a way to replug this
/// <summary>
/// Adds a default frustum culling for rendering only meshes that are only inside the frustum/
/// </summary>
/// <param name="modelRenderer">The model renderer.</param>
/// <returns>ModelRenderer.</returns>
//public static ModelComponentRenderer AddDefaultFrustumCulling(this ModelComponentRenderer modelRenderer)
//{
// modelRenderer.UpdateMeshes = FrustumCulling;
// return modelRenderer;
//}
private static void FrustumCulling(RenderContext context, FastList<RenderMesh> meshes)
{
Matrix viewProjection, mat1, mat2;
// Compute view * projection
context.Parameters.Get(TransformationKeys.View, out mat1);
context.Parameters.Get(TransformationKeys.Projection, out mat2);
Matrix.Multiply(ref mat1, ref mat2, out viewProjection);
var frustum = new BoundingFrustum(ref viewProjection);
for (var i = 0; i < meshes.Count; ++i)
{
var renderMesh = meshes[i];
// Fast AABB transform: http://zeuxcg.org/2010/10/17/aabb-from-obb-with-component-wise-abs/
// Get world matrix
renderMesh.Mesh.Parameters.Get(TransformationKeys.World, out mat1);
// Compute transformed AABB (by world)
var boundingBoxExt = new BoundingBoxExt(renderMesh.Mesh.BoundingBox);
boundingBoxExt.Transform(mat1);
// Perform frustum culling
if (!frustum.Contains(ref boundingBoxExt))
{
meshes.SwapRemoveAt(i--);
}
}
}
private void PrepareRenderMeshes(RenderModel renderModel, List<Mesh> meshes, ref FastListStruct<RenderMesh> renderMeshes, RenderItemCollection opaqueList, RenderItemCollection transparentList)
{
// Add new render meshes
for (int i = renderMeshes.Count; i < meshes.Count; i++)
{
var renderMesh = new RenderMesh(renderModel, meshes[i]);
renderMeshes.Add(renderMesh);
}
// Create the bounding frustum locally on the stack, so that frustum.Contains is performed with boundingBox that is also on the stack
var frustum = new BoundingFrustum(ref ViewProjectionMatrix);
for (int i = 0; i < renderMeshes.Count; i++)
{
var renderMesh = renderMeshes[i];
// Update the model hierarchy
var modelViewHierarchy = renderModel.ModelComponent.ModelViewHierarchy;
modelViewHierarchy.UpdateRenderMesh(renderMesh);
if (!renderMesh.Enabled)
{
continue;
}
// Upload skinning blend matrices
BoundingBoxExt boundingBox;
skinningUpdater.Update(modelViewHierarchy, renderMesh, out boundingBox);
// Fast AABB transform: http://zeuxcg.org/2010/10/17/aabb-from-obb-with-component-wise-abs/
// Compute transformed AABB (by world)
// TODO: CullingMode should be pluggable
// TODO: This should not be necessary. Add proper bounding boxes to gizmos etc.
if (CullingMode == CullingMode.Frustum && boundingBox.Extent != Vector3.Zero && !frustum.Contains(ref boundingBox))
{
continue;
}
// Project the position
// TODO: This could be done in a SIMD batch, but we need to figure-out how to plugin in with RenderMesh object
var worldPosition = new Vector4(renderMesh.WorldMatrix.TranslationVector, 1.0f);
Vector4 projectedPosition;
Vector4.Transform(ref worldPosition, ref ViewProjectionMatrix, out projectedPosition);
var projectedZ = projectedPosition.Z / projectedPosition.W;
renderMesh.RasterizerState = renderMesh.IsGeometryInverted ? RasterizerStateForInvertedGeometry : RasterizerState;
renderMesh.UpdateMaterial();
var list = renderMesh.HasTransparency ? transparentList : opaqueList;
list.Add(new RenderItem(this, renderMesh, projectedZ));
}
}
