2a0a07654a
This node gives access to the integer coordinates of the the voxel that is currently being evaluated by a field. It can be used together with e.g. the Integer Math and Sample Grid Index node to sample neighboring voxel values. Previously, one could only get the position of the voxel in object space. Since sometimes field are evaluated on tiles of many voxels, just having the voxel coordinates can be misleading. Therefore, this same node also outputs whether it is a tile and the extent of the tile (which is 1 for normal voxels). Pull Request: https://projects.blender.org/blender/blender/pulls/147268
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/* SPDX-FileCopyrightText: 2025 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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#include "FN_field.hh"
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#include "BLI_math_basis_types.hh"
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#ifdef WITH_OPENVDB
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# include "openvdb_fwd.hh"
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namespace blender::bke {
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/**
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* A field context that allows computing a value per voxel. Each voxel is defined by a 3D integer
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* coordinate and a transform matrix.
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*/
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class VoxelFieldContext : public fn::FieldContext {
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private:
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const openvdb::math::Transform &transform_;
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Span<openvdb::Coord> voxels_;
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public:
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VoxelFieldContext(const openvdb::math::Transform &transform, Span<openvdb::Coord> voxels);
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GVArray get_varray_for_input(const fn::FieldInput &field_input,
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const IndexMask &mask,
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ResourceScope &scope) const override;
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Span<openvdb::Coord> voxels() const
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{
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return voxels_;
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}
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};
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/**
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* Similar to #VoxelFieldContext, but allows computing values for tiles. A tile contains multiple
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* voxels.
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*/
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class TilesFieldContext : public fn::FieldContext {
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private:
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const openvdb::math::Transform &transform_;
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Span<openvdb::CoordBBox> tiles_;
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public:
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TilesFieldContext(const openvdb::math::Transform &transform,
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const Span<openvdb::CoordBBox> tiles);
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GVArray get_varray_for_input(const fn::FieldInput &field_input,
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const IndexMask &mask,
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ResourceScope &scope) const override;
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Span<openvdb::CoordBBox> tiles() const
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{
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return tiles_;
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}
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};
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class VoxelCoordinateFieldInput : public fn::FieldInput {
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private:
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math::Axis axis_;
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public:
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VoxelCoordinateFieldInput(math::Axis axis);
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GVArray get_varray_for_context(const fn::FieldContext &context,
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const IndexMask &mask,
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ResourceScope &scope) const override;
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};
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class VoxelExtentFieldInput : public fn::FieldInput {
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private:
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math::Axis axis_;
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public:
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VoxelExtentFieldInput(math::Axis axis);
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GVArray get_varray_for_context(const fn::FieldContext &context,
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const IndexMask &mask,
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ResourceScope &scope) const override;
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};
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class IsTileFieldInput : public fn::FieldInput {
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public:
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IsTileFieldInput();
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GVArray get_varray_for_context(const fn::FieldContext &context,
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const IndexMask &mask,
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ResourceScope &scope) const override;
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};
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} // namespace blender::bke
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#endif
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