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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
/* Motion Triangle Primitive
*
* These are stored as regular triangles, plus extra positions and normals at
* times other than the frame center. Computing the triangle vertex positions
* or normals at a given ray time is a matter of interpolation of the two steps
* between which the ray time lies.
*
* The extra positions and normals are stored as ATTR_STD_MOTION_VERTEX_POSITION
* and ATTR_STD_MOTION_VERTEX_NORMAL mesh attributes.
*/
#pragma once
#include "kernel/bvh/util.h"
CCL_NAMESPACE_BEGIN
/* Time interpolation of vertex positions and normals */
ccl_device_inline void motion_triangle_verts_for_step(KernelGlobals kg,
uint4 tri_vindex,
int offset,
int numverts,
int numsteps,
int step,
float3 verts[3])
{
if (step == numsteps) {
/* center step: regular vertex location */
verts[0] = kernel_data_fetch(tri_verts, tri_vindex.w + 0);
verts[1] = kernel_data_fetch(tri_verts, tri_vindex.w + 1);
verts[2] = kernel_data_fetch(tri_verts, tri_vindex.w + 2);
}
else {
/* center step not store in this array */
if (step > numsteps)
step--;
offset += step * numverts;
verts[0] = kernel_data_fetch(attributes_float3, offset + tri_vindex.x);
verts[1] = kernel_data_fetch(attributes_float3, offset + tri_vindex.y);
verts[2] = kernel_data_fetch(attributes_float3, offset + tri_vindex.z);
}
}
ccl_device_inline void motion_triangle_normals_for_step(KernelGlobals kg,
uint4 tri_vindex,
int offset,
int numverts,
int numsteps,
int step,
float3 normals[3])
{
if (step == numsteps) {
/* center step: regular vertex location */
normals[0] = kernel_data_fetch(tri_vnormal, tri_vindex.x);
normals[1] = kernel_data_fetch(tri_vnormal, tri_vindex.y);
normals[2] = kernel_data_fetch(tri_vnormal, tri_vindex.z);
}
else {
/* center step is not stored in this array */
if (step > numsteps)
step--;
offset += step * numverts;
normals[0] = kernel_data_fetch(attributes_float3, offset + tri_vindex.x);
normals[1] = kernel_data_fetch(attributes_float3, offset + tri_vindex.y);
normals[2] = kernel_data_fetch(attributes_float3, offset + tri_vindex.z);
}
}
ccl_device_inline void motion_triangle_vertices(
KernelGlobals kg, int object, int prim, float time, float3 verts[3])
{
/* get motion info */
int numsteps, numverts;
object_motion_info(kg, object, &numsteps, &numverts, NULL);
/* figure out which steps we need to fetch and their interpolation factor */
int maxstep = numsteps * 2;
int step = min((int)(time * maxstep), maxstep - 1);
float t = time * maxstep - step;
/* find attribute */
int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_POSITION);
kernel_assert(offset != ATTR_STD_NOT_FOUND);
/* fetch vertex coordinates */
float3 next_verts[3];
uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step, verts);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step + 1, next_verts);
/* interpolate between steps */
verts[0] = (1.0f - t) * verts[0] + t * next_verts[0];
verts[1] = (1.0f - t) * verts[1] + t * next_verts[1];
verts[2] = (1.0f - t) * verts[2] + t * next_verts[2];
}
ccl_device_inline void motion_triangle_vertices_and_normals(
KernelGlobals kg, int object, int prim, float time, float3 verts[3], float3 normals[3])
{
/* get motion info */
int numsteps, numverts;
object_motion_info(kg, object, &numsteps, &numverts, NULL);
/* Figure out which steps we need to fetch and their interpolation factor. */
int maxstep = numsteps * 2;
int step = min((int)(time * maxstep), maxstep - 1);
float t = time * maxstep - step;
/* Find attribute. */
int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_POSITION);
kernel_assert(offset != ATTR_STD_NOT_FOUND);
/* Fetch vertex coordinates. */
float3 next_verts[3];
uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step, verts);
motion_triangle_verts_for_step(kg, tri_vindex, offset, numverts, numsteps, step + 1, next_verts);
/* Interpolate between steps. */
verts[0] = (1.0f - t) * verts[0] + t * next_verts[0];
verts[1] = (1.0f - t) * verts[1] + t * next_verts[1];
verts[2] = (1.0f - t) * verts[2] + t * next_verts[2];
/* Compute smooth normal. */
/* Find attribute. */
offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_NORMAL);
kernel_assert(offset != ATTR_STD_NOT_FOUND);
/* Fetch vertex coordinates. */
float3 next_normals[3];
motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals);
motion_triangle_normals_for_step(
kg, tri_vindex, offset, numverts, numsteps, step + 1, next_normals);
/* Interpolate between steps. */
normals[0] = (1.0f - t) * normals[0] + t * next_normals[0];
normals[1] = (1.0f - t) * normals[1] + t * next_normals[1];
normals[2] = (1.0f - t) * normals[2] + t * next_normals[2];
}
ccl_device_inline float3 motion_triangle_smooth_normal(
KernelGlobals kg, float3 Ng, int object, int prim, float u, float v, float time)
{
/* get motion info */
int numsteps, numverts;
object_motion_info(kg, object, &numsteps, &numverts, NULL);
/* figure out which steps we need to fetch and their interpolation factor */
int maxstep = numsteps * 2;
int step = min((int)(time * maxstep), maxstep - 1);
float t = time * maxstep - step;
/* find attribute */
int offset = intersection_find_attribute(kg, object, ATTR_STD_MOTION_VERTEX_NORMAL);
kernel_assert(offset != ATTR_STD_NOT_FOUND);
/* fetch normals */
float3 normals[3], next_normals[3];
uint4 tri_vindex = kernel_data_fetch(tri_vindex, prim);
motion_triangle_normals_for_step(kg, tri_vindex, offset, numverts, numsteps, step, normals);
motion_triangle_normals_for_step(
kg, tri_vindex, offset, numverts, numsteps, step + 1, next_normals);
/* interpolate between steps */
normals[0] = (1.0f - t) * normals[0] + t * next_normals[0];
normals[1] = (1.0f - t) * normals[1] + t * next_normals[1];
normals[2] = (1.0f - t) * normals[2] + t * next_normals[2];
/* interpolate between vertices */
float w = 1.0f - u - v;
float3 N = safe_normalize(u * normals[0] + v * normals[1] + w * normals[2]);
return is_zero(N) ? Ng : N;
}
CCL_NAMESPACE_END
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