5152c7c152
For transparency, volume and light intersection rays, adjust these distances rather than the ray start position. This way we increment the start distance by the smallest possible float increment to avoid self intersections, and be sure it works as the distance compared to be will be exactly the same as before, due to the ray start position and direction remaining the same. Fix T98764, T96537, hair ray tracing precision issues. Differential Revision: https://developer.blender.org/D15455
113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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#include "kernel/camera/camera.h"
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#include "kernel/film/accumulate.h"
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#include "kernel/film/adaptive_sampling.h"
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#include "kernel/integrator/path_state.h"
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#include "kernel/integrator/shadow_catcher.h"
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#include "kernel/sample/pattern.h"
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CCL_NAMESPACE_BEGIN
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ccl_device_inline void integrate_camera_sample(KernelGlobals kg,
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const int sample,
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const int x,
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const int y,
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const uint rng_hash,
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ccl_private Ray *ray)
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{
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/* Filter sampling. */
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float filter_u, filter_v;
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if (sample == 0) {
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filter_u = 0.5f;
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filter_v = 0.5f;
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}
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else {
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path_rng_2D(kg, rng_hash, sample, PRNG_FILTER_U, &filter_u, &filter_v);
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}
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/* Depth of field sampling. */
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float lens_u = 0.0f, lens_v = 0.0f;
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if (kernel_data.cam.aperturesize > 0.0f) {
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path_rng_2D(kg, rng_hash, sample, PRNG_LENS_U, &lens_u, &lens_v);
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}
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/* Motion blur time sampling. */
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float time = 0.0f;
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#ifdef __CAMERA_MOTION__
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if (kernel_data.cam.shuttertime != -1.0f)
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time = path_rng_1D(kg, rng_hash, sample, PRNG_TIME);
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#endif
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/* Generate camera ray. */
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camera_sample(kg, x, y, filter_u, filter_v, lens_u, lens_v, time, ray);
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}
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/* Return false to indicate that this pixel is finished.
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* Used by CPU implementation to not attempt to sample pixel for multiple samples once its known
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* that the pixel did converge. */
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ccl_device bool integrator_init_from_camera(KernelGlobals kg,
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IntegratorState state,
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ccl_global const KernelWorkTile *ccl_restrict tile,
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ccl_global float *render_buffer,
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const int x,
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const int y,
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const int scheduled_sample)
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{
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PROFILING_INIT(kg, PROFILING_RAY_SETUP);
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/* Initialize path state to give basic buffer access and allow early outputs. */
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path_state_init(state, tile, x, y);
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/* Check whether the pixel has converged and should not be sampled anymore. */
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if (!kernel_need_sample_pixel(kg, state, render_buffer)) {
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return false;
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}
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/* Count the sample and get an effective sample for this pixel.
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*
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* This logic allows to both count actual number of samples per pixel, and to add samples to this
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* pixel after it was converged and samples were added somewhere else (in which case the
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* `scheduled_sample` will be different from actual number of samples in this pixel). */
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const int sample = kernel_accum_sample(
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kg, state, render_buffer, scheduled_sample, tile->sample_offset);
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/* Initialize random number seed for path. */
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const uint rng_hash = path_rng_hash_init(kg, sample, x, y);
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{
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/* Generate camera ray. */
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Ray ray;
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integrate_camera_sample(kg, sample, x, y, rng_hash, &ray);
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if (ray.tmax == 0.0f) {
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return true;
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}
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/* Write camera ray to state. */
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integrator_state_write_ray(kg, state, &ray);
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}
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/* Initialize path state for path integration. */
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path_state_init_integrator(kg, state, sample, rng_hash);
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/* Continue with intersect_closest kernel, optionally initializing volume
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* stack before that if the camera may be inside a volume. */
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if (kernel_data.cam.is_inside_volume) {
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integrator_path_init(kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_VOLUME_STACK);
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}
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else {
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integrator_path_init(kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);
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}
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return true;
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}
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CCL_NAMESPACE_END
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