diff options
author | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2020-03-16 16:42:56 +0300 |
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committer | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2020-03-18 13:23:05 +0300 |
commit | 7537cad5761e4778da7aed02410c5811114c24e5 (patch) | |
tree | 94b0187257e08ecaeaad5cef9eaaa4ec49aa04fd /intern/cycles/render/object.cpp | |
parent | 1162ba206dd7792414d3ae716877ba1383de8dab (diff) |
Volumes: add render settings for volume datablock
* Space: volume density and step size in object or world space
* Step Size: override automatic step size
* Clipping: values below this are ignored for tighter volume bounds
The last two are Cycles only currently.
Ref T73201
Diffstat (limited to 'intern/cycles/render/object.cpp')
-rw-r--r-- | intern/cycles/render/object.cpp | 52 |
1 files changed, 40 insertions, 12 deletions
diff --git a/intern/cycles/render/object.cpp b/intern/cycles/render/object.cpp index c84007823d2..342a641c0be 100644 --- a/intern/cycles/render/object.cpp +++ b/intern/cycles/render/object.cpp @@ -270,14 +270,20 @@ uint Object::visibility_for_tracing() const float Object::compute_volume_step_size() const { - if (!geometry->has_volume) { + if (geometry->type != Geometry::MESH) { + return FLT_MAX; + } + + Mesh *mesh = static_cast<Mesh *>(geometry); + + if (!mesh->has_volume) { return FLT_MAX; } /* Compute step rate from shaders. */ float step_rate = FLT_MAX; - foreach (Shader *shader, geometry->used_shaders) { + foreach (Shader *shader, mesh->used_shaders) { if (shader->has_volume) { if ((shader->heterogeneous_volume && shader->has_volume_spatial_varying) || (shader->has_volume_attribute_dependency)) { @@ -293,7 +299,7 @@ float Object::compute_volume_step_size() const /* Compute step size from voxel grids. */ float step_size = FLT_MAX; - foreach (Attribute &attr, geometry->attributes.attributes) { + foreach (Attribute &attr, mesh->attributes.attributes) { if (attr.element == ATTR_ELEMENT_VOXEL) { ImageHandle &handle = attr.data_voxel(); const ImageMetaData &metadata = handle.metadata(); @@ -301,15 +307,26 @@ float Object::compute_volume_step_size() const continue; } - /* Step size is transformed from voxel to world space. */ - Transform voxel_tfm = tfm; - if (metadata.use_transform_3d) { - voxel_tfm = tfm * transform_inverse(metadata.transform_3d); - } + /* User specified step size. */ + float voxel_step_size = mesh->volume_step_size; + + if (voxel_step_size == 0.0f) { + /* Auto detect step size. */ + float3 size = make_float3( + 1.0f / metadata.width, 1.0f / metadata.height, 1.0f / metadata.depth); - float3 size = make_float3( - 1.0f / metadata.width, 1.0f / metadata.height, 1.0f / metadata.depth); - float voxel_step_size = min3(fabs(transform_direction(&voxel_tfm, size))); + /* Step size is transformed from voxel to world space. */ + Transform voxel_tfm = tfm; + if (metadata.use_transform_3d) { + voxel_tfm = tfm * transform_inverse(metadata.transform_3d); + } + voxel_step_size = min3(fabs(transform_direction(&voxel_tfm, size))); + } + else if (mesh->volume_object_space) { + /* User specified step size in object space. */ + float3 size = make_float3(voxel_step_size, voxel_step_size, voxel_step_size); + voxel_step_size = min3(fabs(transform_direction(&tfm, size))); + } if (voxel_step_size > 0.0f) { step_size = fminf(voxel_step_size, step_size); @@ -352,12 +369,23 @@ static float object_surface_area(UpdateObjectTransformState *state, return 0.0f; } + Mesh *mesh = static_cast<Mesh *>(geom); + if (mesh->has_volume) { + /* Volume density automatically adjust to object scale. */ + if (mesh->volume_object_space) { + const float3 unit = normalize(make_float3(1.0f, 1.0f, 1.0f)); + return 1.0f / len(transform_direction(&tfm, unit)); + } + else { + return 1.0f; + } + } + /* Compute surface area. for uniform scale we can do avoid the many * transform calls and share computation for instances. * * TODO(brecht): Correct for displacement, and move to a better place. */ - Mesh *mesh = static_cast<Mesh *>(geom); float surface_area = 0.0f; float uniform_scale; if (transform_uniform_scale(tfm, uniform_scale)) { |