35b1e9fc3a
This add support for rendering of the point cloud object in Blender, as a native geometry type in Cycles that is more memory and time efficient than instancing sphere meshes. This can be useful for rendering sand, water splashes, particles, motion graphics, etc. Points are currently always rendered as spheres, with backface culling. More shapes are likely to be added later, but this is the most important one and can be customized with shaders. For CPU rendering the Embree primitive is used, for GPU there is our own intersection code. Motion blur is suppored. Volumes inside points are not currently supported. Implemented with help from: * Kévin Dietrich: Alembic procedural integration * Patrick Mourse: OptiX integration * Josh Whelchel: update for cycles-x changes Ref T92573 Differential Revision: https://developer.blender.org/D9887
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
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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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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Motion Point Primitive
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*
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* These are stored as regular points, plus extra positions and radii at times
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* other than the frame center. Computing the point at a given ray time is
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* a matter of interpolation of the two steps between which the ray time lies.
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*
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* The extra points are stored as ATTR_STD_MOTION_VERTEX_POSITION.
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*/
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#ifdef __POINTCLOUD__
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ccl_device_inline float4
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motion_point_for_step(KernelGlobals kg, int offset, int numkeys, int numsteps, int step, int prim)
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{
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if (step == numsteps) {
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/* center step: regular key location */
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return kernel_tex_fetch(__points, prim);
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}
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else {
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/* center step is not stored in this array */
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if (step > numsteps)
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step--;
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offset += step * numkeys;
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return kernel_tex_fetch(__attributes_float4, offset + prim);
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}
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}
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/* return 2 point key locations */
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ccl_device_inline float4 motion_point(KernelGlobals kg, int object, int prim, float time)
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{
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/* get motion info */
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int numsteps, numkeys;
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object_motion_info(kg, object, &numsteps, NULL, &numkeys);
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/* figure out which steps we need to fetch and their interpolation factor */
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int maxstep = numsteps * 2;
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int step = min((int)(time * maxstep), maxstep - 1);
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float t = time * maxstep - step;
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/* find attribute */
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int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_POSITION);
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kernel_assert(offset != ATTR_STD_NOT_FOUND);
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/* fetch key coordinates */
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float4 point = motion_point_for_step(kg, offset, numkeys, numsteps, step, prim);
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float4 next_point = motion_point_for_step(kg, offset, numkeys, numsteps, step + 1, prim);
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/* interpolate between steps */
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return (1.0f - t) * point + t * next_point;
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}
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#endif
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CCL_NAMESPACE_END
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