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Add ability to specify a material assignment to a mesh asset.

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This extends both the spec and the XML definition to allow specification of a material name on a mesh. This material acts as a fallback in the case that the referencing geom element does not specify a material of it's own.

PiperOrigin-RevId: 798232378
Change-Id: Iaf300c727732744ea1b613e64334ee505ac6e209
This commit is contained in:
Sam Haves
2025-08-22 09:10:35 -07:00
committed by Copybara-Service
parent 42d8454555
commit 1fb1810b07
13 changed files with 120 additions and 29 deletions
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doc/XMLreference.rst
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@@ -1424,6 +1424,11 @@ The full list of processing steps applied by the compiler to each mesh is as fol
The parameters used to generate a builtin mesh. The number and type of parameters and their semantic depends on the
mesh type. See :ref:`mesh/builtin<asset-mesh-builtin>` for details.
.. _asset-mesh-material:
:at:`material`: :at-val:`string, optional`
Fallback material for mesh geoms that do not specify their own material.
.. _mesh-plugin:
:el-prefix:`mesh/` |-| **plugin** (?)
@@ -2553,13 +2558,15 @@ helps clarify the role of bodies and geoms in MuJoCo.
.. _body-geom-material:
:at:`material`: :at-val:`string, optional`
If specified, this attribute applies a material to the geom. The material determines the visual properties of the
geom. The only exception is color: if the rgba attribute below is different from its internal default, it takes
precedence while the remaining material properties are still applied. Note that if the same material is referenced
from multiple geoms (as well as sites and tendons) and the user changes some of its properties at runtime, these
changes will take effect immediately for all model elements referencing the material. This is because the compiler
saves the material and its properties as a separate element in mjModel, and the elements using this material only
keep a reference to it.
If specified, this attribute applies a material to the geom. Otherwise, if unspecified and the type of the geom is
a **mesh** the compiler will apply the mesh asset :ref:`material <asset-mesh-material>` if present.
The material determines the visual properties of the geom. The only exception is color: if the rgba attribute below
is different from its internal default, it takes precedence while the remaining material properties are still
applied. Note that if the same material is referenced from multiple geoms (as well as sites and tendons) and the user
changes some of its properties at runtime, these changes will take effect immediately for all model elements
referencing the material. This is because the compiler saves the material and its properties as a separate element in
mjModel, and the elements using this material only keep a reference to it.
.. _body-geom-rgba: