forked from bartvdbraak/blender
7377d411b4
around the volume. We generate a tight mesh around the active voxels of the volume in order to effectively skip empty space, and start volume ray marching as close to interesting volume data as possible. See code comments for details on how the mesh generation algorithm works. This gives up to 2x speedups in some scenes. Reviewed by: brecht, dingto Reviewers: #cycles Subscribers: lvxejay, jtheninja, brecht Differential Revision: https://developer.blender.org/D3038
386 lines
11 KiB
C++
386 lines
11 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __MESH_H__
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#define __MESH_H__
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#include "graph/node.h"
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#include "render/attribute.h"
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#include "render/shader.h"
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#include "util/util_boundbox.h"
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#include "util/util_list.h"
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#include "util/util_map.h"
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#include "util/util_param.h"
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#include "util/util_transform.h"
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#include "util/util_types.h"
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#include "util/util_vector.h"
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CCL_NAMESPACE_BEGIN
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class Attribute;
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class BVH;
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class Device;
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class DeviceScene;
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class Mesh;
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class Progress;
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class Scene;
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class SceneParams;
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class AttributeRequest;
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struct SubdParams;
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class DiagSplit;
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struct PackedPatchTable;
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/* Mesh */
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class Mesh : public Node {
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public:
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NODE_DECLARE
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/* Mesh Triangle */
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struct Triangle {
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int v[3];
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void bounds_grow(const float3 *verts, BoundBox& bounds) const;
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void motion_verts(const float3 *verts,
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const float3 *vert_steps,
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size_t num_verts,
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size_t num_steps,
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float time,
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float3 r_verts[3]) const;
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void verts_for_step(const float3 *verts,
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const float3 *vert_steps,
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size_t num_verts,
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size_t num_steps,
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size_t step,
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float3 r_verts[3]) const;
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float3 compute_normal(const float3 *verts) const;
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bool valid(const float3 *verts) const;
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};
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Triangle get_triangle(size_t i) const
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{
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Triangle tri = {{triangles[i*3 + 0],
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triangles[i*3 + 1],
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triangles[i*3 + 2]}};
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return tri;
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}
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size_t num_triangles() const
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{
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return triangles.size() / 3;
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}
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/* Mesh Curve */
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struct Curve {
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int first_key;
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int num_keys;
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int num_segments() { return num_keys - 1; }
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void bounds_grow(const int k,
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const float3 *curve_keys,
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const float *curve_radius,
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BoundBox& bounds) const;
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void bounds_grow(float4 keys[4], BoundBox& bounds) const;
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void bounds_grow(const int k,
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const float3 *curve_keys,
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const float *curve_radius,
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const Transform& aligned_space,
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BoundBox& bounds) const;
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void motion_keys(const float3 *curve_keys,
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const float *curve_radius,
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const float3 *key_steps,
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size_t num_curve_keys,
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size_t num_steps,
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float time,
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size_t k0, size_t k1,
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float4 r_keys[2]) const;
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void cardinal_motion_keys(const float3 *curve_keys,
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const float *curve_radius,
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const float3 *key_steps,
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size_t num_curve_keys,
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size_t num_steps,
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float time,
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size_t k0, size_t k1,
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size_t k2, size_t k3,
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float4 r_keys[4]) const;
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void keys_for_step(const float3 *curve_keys,
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const float *curve_radius,
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const float3 *key_steps,
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size_t num_curve_keys,
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size_t num_steps,
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size_t step,
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size_t k0, size_t k1,
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float4 r_keys[2]) const;
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void cardinal_keys_for_step(const float3 *curve_keys,
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const float *curve_radius,
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const float3 *key_steps,
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size_t num_curve_keys,
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size_t num_steps,
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size_t step,
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size_t k0, size_t k1,
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size_t k2, size_t k3,
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float4 r_keys[4]) const;
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};
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Curve get_curve(size_t i) const
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{
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int first = curve_first_key[i];
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int next_first = (i+1 < curve_first_key.size()) ? curve_first_key[i+1] : curve_keys.size();
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Curve curve = {first, next_first - first};
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return curve;
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}
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size_t num_curves() const
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{
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return curve_first_key.size();
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}
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/* Mesh SubdFace */
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struct SubdFace {
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int start_corner;
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int num_corners;
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int shader;
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bool smooth;
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int ptex_offset;
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bool is_quad() { return num_corners == 4; }
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float3 normal(const Mesh *mesh) const;
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int num_ptex_faces() const { return num_corners == 4 ? 1 : num_corners; }
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};
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struct SubdEdgeCrease {
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int v[2];
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float crease;
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};
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enum SubdivisionType {
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SUBDIVISION_NONE,
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SUBDIVISION_LINEAR,
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SUBDIVISION_CATMULL_CLARK,
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};
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SubdivisionType subdivision_type;
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/* Mesh Data */
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enum GeometryFlags {
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GEOMETRY_NONE = 0,
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GEOMETRY_TRIANGLES = (1 << 0),
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GEOMETRY_CURVES = (1 << 1),
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};
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int geometry_flags; /* used to distinguish meshes with no verts
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and meshed for which geometry is not created */
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array<int> triangles;
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array<float3> verts;
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array<int> shader;
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array<bool> smooth;
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/* used for storing patch info for subd triangles, only allocated if there are patches */
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array<int> triangle_patch; /* must be < 0 for non subd triangles */
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array<float2> vert_patch_uv;
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float volume_isovalue;
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bool has_volume; /* Set in the device_update_flags(). */
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bool has_surface_bssrdf; /* Set in the device_update_flags(). */
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array<float3> curve_keys;
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array<float> curve_radius;
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array<int> curve_first_key;
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array<int> curve_shader;
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array<SubdFace> subd_faces;
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array<int> subd_face_corners;
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int num_ngons;
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array<SubdEdgeCrease> subd_creases;
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SubdParams *subd_params;
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vector<Shader*> used_shaders;
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AttributeSet attributes;
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AttributeSet curve_attributes;
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AttributeSet subd_attributes;
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BoundBox bounds;
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bool transform_applied;
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bool transform_negative_scaled;
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Transform transform_normal;
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PackedPatchTable *patch_table;
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uint motion_steps;
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bool use_motion_blur;
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/* Update Flags */
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bool need_update;
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bool need_update_rebuild;
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/* BVH */
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BVH *bvh;
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size_t tri_offset;
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size_t vert_offset;
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size_t curve_offset;
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size_t curvekey_offset;
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size_t patch_offset;
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size_t patch_table_offset;
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size_t face_offset;
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size_t corner_offset;
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size_t attr_map_offset;
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size_t num_subd_verts;
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/* Functions */
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Mesh();
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~Mesh();
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void resize_mesh(int numverts, int numfaces);
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void reserve_mesh(int numverts, int numfaces);
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void resize_curves(int numcurves, int numkeys);
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void reserve_curves(int numcurves, int numkeys);
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void resize_subd_faces(int numfaces, int num_ngons, int numcorners);
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void reserve_subd_faces(int numfaces, int num_ngons, int numcorners);
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void clear(bool preserve_voxel_data = false);
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void add_vertex(float3 P);
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void add_vertex_slow(float3 P);
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void add_triangle(int v0, int v1, int v2, int shader, bool smooth);
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void add_curve_key(float3 loc, float radius);
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void add_curve(int first_key, int shader);
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void add_subd_face(int* corners, int num_corners, int shader_, bool smooth_);
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int split_vertex(int vertex);
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void compute_bounds();
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void add_face_normals();
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void add_vertex_normals();
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void add_undisplaced();
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void pack_normals(Scene *scene, uint *shader, float4 *vnormal);
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void pack_verts(const vector<uint>& tri_prim_index,
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uint4 *tri_vindex,
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uint *tri_patch,
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float2 *tri_patch_uv,
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size_t vert_offset,
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size_t tri_offset);
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void pack_curves(Scene *scene, float4 *curve_key_co, float4 *curve_data, size_t curvekey_offset);
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void pack_patches(uint *patch_data, uint vert_offset, uint face_offset, uint corner_offset);
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void compute_bvh(Device *device,
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DeviceScene *dscene,
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SceneParams *params,
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Progress *progress,
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int n,
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int total);
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bool need_attribute(Scene *scene, AttributeStandard std);
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bool need_attribute(Scene *scene, ustring name);
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void tag_update(Scene *scene, bool rebuild);
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bool has_motion_blur() const;
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bool has_true_displacement() const;
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/* Check whether the mesh should have own BVH built separately. Briefly,
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* own BVH is needed for mesh, if:
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*
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* - It is instanced multiple times, so each instance object should share the
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* same BVH tree.
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* - Special ray intersection is needed, for example to limit subsurface rays
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* to only the mesh itself.
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*/
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bool need_build_bvh() const;
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/* Check if the mesh should be treated as instanced. */
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bool is_instanced() const;
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void tessellate(DiagSplit *split);
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};
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/* Mesh Manager */
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class MeshManager {
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public:
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bool need_update;
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bool need_flags_update;
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MeshManager();
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~MeshManager();
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bool displace(Device *device, DeviceScene *dscene, Scene *scene, Mesh *mesh, Progress& progress);
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/* attributes */
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void update_osl_attributes(Device *device, Scene *scene, vector<AttributeRequestSet>& mesh_attributes);
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void update_svm_attributes(Device *device, DeviceScene *dscene, Scene *scene, vector<AttributeRequestSet>& mesh_attributes);
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void device_update_preprocess(Device *device, Scene *scene, Progress& progress);
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void device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress);
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void device_free(Device *device, DeviceScene *dscene);
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void tag_update(Scene *scene);
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void create_volume_mesh(Scene *scene, Mesh *mesh, Progress &progress);
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protected:
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/* Calculate verts/triangles/curves offsets in global arrays. */
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void mesh_calc_offset(Scene *scene);
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void device_update_object(Device *device,
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DeviceScene *dscene,
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Scene *scene,
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Progress& progress);
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void device_update_mesh(Device *device,
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DeviceScene *dscene,
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Scene *scene,
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bool for_displacement,
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Progress& progress);
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void device_update_attributes(Device *device,
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DeviceScene *dscene,
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Scene *scene,
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Progress& progress);
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void device_update_bvh(Device *device,
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DeviceScene *dscene,
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Scene *scene,
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Progress& progress);
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void device_update_displacement_images(Device *device,
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Scene *scene,
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Progress& progress);
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void device_update_volume_images(Device *device,
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Scene *scene,
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Progress& progress);
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};
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CCL_NAMESPACE_END
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#endif /* __MESH_H__ */
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