forked from bartvdbraak/blender
c1a27a76cf
This way we prevent cracks in the model due to discontinuous normals, by using smooth normals for displacement instead of always getting flat normals after linear subdivision. Reviewed By: brecht Differential Revision: https://developer.blender.org/D1916
73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __SUBD_PATCH_H__
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#define __SUBD_PATCH_H__
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#include "util_boundbox.h"
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#include "util_types.h"
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CCL_NAMESPACE_BEGIN
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class Patch {
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public:
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virtual ~Patch() {}
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virtual void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v) = 0;
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virtual bool is_triangle() { return false; }
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virtual BoundBox bound() = 0;
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virtual int ptex_face_id() { return -1; }
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};
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/* Linear Quad Patch */
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class LinearQuadPatch : public Patch {
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public:
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float3 hull[4];
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float3 normals[4];
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void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
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bool is_triangle() { return false; }
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BoundBox bound();
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};
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/* Linear Triangle Patch */
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class LinearTrianglePatch : public Patch {
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public:
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float3 hull[3];
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float3 normals[3];
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void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
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bool is_triangle() { return true; }
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BoundBox bound();
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};
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/* Bicubic Patch */
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class BicubicPatch : public Patch {
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public:
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float3 hull[16];
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void eval(float3 *P, float3 *dPdu, float3 *dPdv, float3 *N, float u, float v);
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bool is_triangle() { return false; }
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BoundBox bound();
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};
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CCL_NAMESPACE_END
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#endif /* __SUBD_PATCH_H__ */
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