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Fix: Cycles volume performance issue on Nvidia

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Pass by value instead of reference partially fixes the performance issue
mentioned in #147921

Pull Request: https://projects.blender.org/blender/blender/pulls/147989
This commit is contained in:
weizhen
2025-10-15 11:23:52 +02:00
committed by Weizhen Huang
parent 408a0b58d4
commit 6c241737e8
1 changed files with 8 additions and 6 deletions
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14
intern/cycles/kernel/integrator/shade_volume.h
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@@ -304,28 +304,29 @@ ccl_device_noinline Extrema<float> volume_estimate_extrema(KernelGlobals kg,
const IntegratorGenericState state,
const ccl_private RNGState *rng_state,
const uint32_t path_flag,
const ccl_private OctreeTracing &octree)
const Interval<float> t,
const VolumeStack entry)
{
const bool homogeneous = volume_is_homogeneous(kg, octree.entry);
const bool homogeneous = volume_is_homogeneous(kg, entry);
const int samples = homogeneous ? 1 : 4;
const float shade_offset = homogeneous ?
0.5f :
path_state_rng_2D(kg, rng_state, PRNG_VOLUME_SHADE_OFFSET).y;
const float step_size = octree.t.length() / float(samples);
const float step_size = t.length() / float(samples);
/* Do not allocate closures. */
sd->num_closure_left = 0;
Extrema<float> extrema = {FLT_MAX, -FLT_MAX};
for (int i = 0; i < samples; i++) {
const float shade_t = octree.t.min + (shade_offset + i) * step_size;
const float shade_t = t.min + (shade_offset + i) * step_size;
sd->P = ray->P + ray->D * shade_t;
sd->closure_transparent_extinction = zero_float3();
sd->closure_emission_background = zero_float3();
volume_shader_eval_entry<shadow, KERNEL_FEATURE_NODE_MASK_VOLUME>(
kg, state, sd, octree.entry, path_flag);
kg, state, sd, entry, path_flag);
const float sigma = reduce_max(sd->closure_transparent_extinction);
const float emission = reduce_max(sd->closure_emission_background);
@@ -359,7 +360,8 @@ ccl_device_inline Extrema<float> volume_object_get_extrema(KernelGlobals kg,
return octree.node->sigma * object_volume_density(kg, octree.entry.object);
}
return volume_estimate_extrema<shadow>(kg, ray, sd, state, rng_state, path_flag, octree);
return volume_estimate_extrema<shadow>(
kg, ray, sd, state, rng_state, path_flag, octree.t, octree.entry);
}
/* Find the octree root node in the kernel array that corresponds to the volume stack entry. */