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https://github.com/blender/blender
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819d52f3d2
Based on the "Stochastic ray tracing of transparent 3D Gaussians" paper by Xin Sun et. al. The basic idea: perform stochastic intersection with the Gaussian splat based on its transparency. Gaussian splats are implemented as a dedicated primitive type, but it shares the same layout for position and radius as points, so a lot of existing functions (positions, attributes, etc) work for both points and splats. For the Embree and hardware intersection it is implemented as a custom primitive type. The choice of using bounding spheres mainly comes from a balance between performance and memory usage. More ideal would be to use OBB, but it is not supported for custom primitive types in Embree and GPU HW-RT on all backends. There is a known limitation that comes from the fact that the datasets are trained in sRGB space and Cycles work in Linear space: areas with low opacity and high radiance render noticeably differently from the ground-truth implementation. Ref #159470 Pull Request: https://projects.blender.org/blender/blender/pulls/163103
66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
/* SPDX-FileCopyrightText: 2018-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#ifdef WITH_EMBREE
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# include <embree4/rtcore.h>
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# include <embree4/rtcore_scene.h>
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# include "bvh/bvh.h"
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# include "bvh/params.h"
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# include "util/vector.h"
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CCL_NAMESPACE_BEGIN
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class Hair;
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class Mesh;
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class PointCloud;
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class BVHEmbree : public BVH {
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public:
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void build(Progress &progress,
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Stats *stats,
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RTCDevice rtc_device,
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const bool rtc_device_is_sycl_ = false);
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void refit(Progress &progress);
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# if defined(WITH_EMBREE_GPU) && RTC_VERSION >= 40302
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RTCError offload_scenes_to_gpu(const vector<RTCScene> &scenes);
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# endif
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const char *get_error_string(RTCError error_code);
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RTCScene scene;
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BVHEmbree(const BVHParams ¶ms,
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const vector<Geometry *> &geometry,
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const vector<Object *> &objects);
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~BVHEmbree() override;
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protected:
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void add_object(Object *ob, const int i);
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void add_instance(Object *ob, const int i);
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void add_curves(const Object *ob, const Hair *hair, const int i);
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void add_points(const Object *ob, const PointCloud *pointcloud, const int i);
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void add_gsplats(const Object *ob, const PointCloud *pointcloud, const int i);
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void add_triangles(const Object *ob, const Mesh *mesh, const int i);
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private:
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void set_tri_vertex_buffer(RTCGeometry geom_id, const Mesh *mesh, const bool update);
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void set_curve_vertex_buffer(RTCGeometry geom_id, const Hair *hair, const bool update);
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void set_point_vertex_buffer(RTCGeometry geom_id,
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const PointCloud *pointcloud,
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const bool update);
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RTCDevice rtc_device;
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bool rtc_device_is_sycl;
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enum RTCBuildQuality build_quality;
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};
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CCL_NAMESPACE_END
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#endif /* WITH_EMBREE */
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