Add Shape::transform
#213
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Add Shape::transform
#213
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bschwind
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Oct 19, 2025
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bschwind
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bschwind
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LGTM, thanks for this and sorry for the super long wait!
| pub fn transform(&self, transform: &DMat4) -> Self { | ||
| let t = crate::transform::gp_trsf(transform); | ||
| // NOTE: Setting the copy argument does not seem to have an effect. | ||
| let mut res = ffi::BRepBuilderAPI_Transform_ctor(&self.inner, &t, true); |
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Could you pull true into a named local variable?
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| let mut res = ffi::BRepBuilderAPI_Transform_ctor(&self.inner, &t, true); | |
| let copy = true; | |
| let mut res = ffi::BRepBuilderAPI_Transform_ctor(&self.inner, &t, copy); |
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Will do! Sorry for taking so long. Very busy at work the past several weeks!
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Summary
gp_Trsf::SetValuestransformmodule, testsgp_trsf(&DMat4) -> gp_TrsfShape::transformDescription
I needed a way to define a
Shapeonce and then duplicate that geometry throughout a model space using transform matrices, similar to "blocks" from the CAD world or "instanced rendering" from the GPU programming world.This PR exposes OCC's implementation of this capability through the
BRepBuilderAPI_Transformclass. This requires using agp_Trsfinstance as the transform matrix. There didn't seem to be a convenient way to construct these from aglamtype, so I added thetransformmodule and a simple test to ensure the construction is correct.One caveat here (that is also noted in the comments) is that the
gp_Trsfconstructor:wcomponent of any columnSo, the values of the output can be different than the input based on the orthogonality of the input.