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Cycles: Add linear curve shape

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Add new "Linear 3D Curves" option in the Curves panel in the render
properties. This renders curves as linear segments rather than smooth
curves, for faster render time at the cost of accuracy.

On NVIDIA Blackwell GPUs, this can give a 6x speedup compared to smooth
curves, due to hardware acceleration. On NVIDIA Ada there is still
a 3x speedup, and CPU and other GPU backends will also render this
faster.

A difference with smooth curves is that these have end caps, as this
was simpler to implement and they are usually helpful anyway.

In the future this functionality will also be used to properly support
the CURVE_TYPE_POLY on the new curves object.

Pull Request: https://projects.blender.org/blender/blender/pulls/139735
This commit is contained in:
Patrick Mours
2025-07-29 17:05:01 +02:00
committed by Brecht Van Lommel
parent 0a1d146389
commit 6487395fa5
26 changed files with 480 additions and 133 deletions
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2
intern/cycles/kernel/device/oneapi/kernel.cpp
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@@ -31,7 +31,7 @@ static const RTCFeatureFlags CYCLES_ONEAPI_EMBREE_BASIC_FEATURES = (const RTCFea
RTC_FEATURE_FLAG_MOTION_BLUR);
static const RTCFeatureFlags CYCLES_ONEAPI_EMBREE_ALL_FEATURES = (const RTCFeatureFlags)(
CYCLES_ONEAPI_EMBREE_BASIC_FEATURES | RTC_FEATURE_FLAG_ROUND_CATMULL_ROM_CURVE |
RTC_FEATURE_FLAG_FLAT_CATMULL_ROM_CURVE);
RTC_FEATURE_FLAG_FLAT_CATMULL_ROM_CURVE | RTC_FEATURE_FLAG_ROUND_LINEAR_CURVE);
# endif
void oneapi_set_error_cb(OneAPIErrorCallback cb, void *user_ptr)