From fd77a28031daff3122ded3a1cb37a7fb44feedf6 Mon Sep 17 00:00:00 2001 From: Brecht Van Lommel Date: Mon, 20 Sep 2021 16:16:11 +0200 Subject: Cycles: bake transparent shadows for hair These transparent shadows can be expansive to evaluate. Especially on the GPU they can lead to poor occupancy when only some pixels require many kernel launches to trace and evaluate many layers of transparency. Baked transparency allows tracing a single ray in many cases by accumulating the throughput directly in the intersection program without recording hits or evaluating shaders. Transparency is baked at curve vertices and interpolated, for most shaders this will look practically the same as actual shader evaluation. Fixes T91428, performance regression with spring demo file due to transparent hair, and makes it render significantly faster than Blender 2.93. Differential Revision: https://developer.blender.org/D12880 --- intern/cycles/integrator/shader_eval.cpp | 6 ++++++ intern/cycles/integrator/shader_eval.h | 1 + 2 files changed, 7 insertions(+) (limited to 'intern/cycles/integrator') diff --git a/intern/cycles/integrator/shader_eval.cpp b/intern/cycles/integrator/shader_eval.cpp index cfc30056f7d..3de7bb6fd16 100644 --- a/intern/cycles/integrator/shader_eval.cpp +++ b/intern/cycles/integrator/shader_eval.cpp @@ -122,6 +122,9 @@ bool ShaderEval::eval_cpu(Device *device, case SHADER_EVAL_BACKGROUND: kernels.shader_eval_background(kg, input_data, output_data, work_index); break; + case SHADER_EVAL_CURVE_SHADOW_TRANSPARENCY: + kernels.shader_eval_curve_shadow_transparency(kg, input_data, output_data, work_index); + break; } }); }); @@ -144,6 +147,9 @@ bool ShaderEval::eval_gpu(Device *device, case SHADER_EVAL_BACKGROUND: kernel = DEVICE_KERNEL_SHADER_EVAL_BACKGROUND; break; + case SHADER_EVAL_CURVE_SHADOW_TRANSPARENCY: + kernel = DEVICE_KERNEL_SHADER_EVAL_CURVE_SHADOW_TRANSPARENCY; + break; }; /* Create device queue. */ diff --git a/intern/cycles/integrator/shader_eval.h b/intern/cycles/integrator/shader_eval.h index 013fad17d4f..43b6b1bdd47 100644 --- a/intern/cycles/integrator/shader_eval.h +++ b/intern/cycles/integrator/shader_eval.h @@ -30,6 +30,7 @@ class Progress; enum ShaderEvalType { SHADER_EVAL_DISPLACE, SHADER_EVAL_BACKGROUND, + SHADER_EVAL_CURVE_SHADOW_TRANSPARENCY, }; /* ShaderEval class performs shader evaluation for background light and displacement. */ -- cgit v1.2.3