blender/intern/cycles/subd/subd_patch.h
Mai Lavelle c96ae81160 Cycles microdisplacement: ngons and attributes for subdivision meshes
This adds support for ngons and attributes on subdivision meshes. Ngons are
needed for proper attribute interpolation as well as correct Catmull-Clark
subdivision. Several changes are made to achieve this:

- new primitive `SubdFace` added to `Mesh`
- 3 more textures are used to store info on patches from subd meshes
- Blender export uses loop interface instead of tessface for subd meshes
- `Attribute` class is updated with a simplified way to pass primitive counts
  around and to support ngons.
- extra points for ngons are generated for O(1) attribute interpolation
- curves are temporally disabled on subd meshes to avoid various bugs with
  implementation
- old unneeded code is removed from `subd/`
- various fixes and improvements

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2108
2016-07-29 03:36:30 -04:00

61 lines
1.4 KiB
C++

/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __SUBD_PATCH_H__
#define __SUBD_PATCH_H__
#include "util_boundbox.h"
#include "util_types.h"
CCL_NAMESPACE_BEGIN
class Patch {
public:
virtual ~Patch() {}
virtual void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v) = 0;
virtual BoundBox bound() = 0;
virtual int ptex_face_id() { return -1; }
int patch_index;
int shader;
};
/* Linear Quad Patch */
class LinearQuadPatch : public Patch {
public:
float3 hull[4];
float3 normals[4];
void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
BoundBox bound();
};
/* Bicubic Patch */
class BicubicPatch : public Patch {
public:
float3 hull[16];
void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
BoundBox bound();
};
CCL_NAMESPACE_END
#endif /* __SUBD_PATCH_H__ */