Material colours assigned to primitives in UI are not saved correctly

[joshnewans]

Environment

• OS Version: Ubuntu 24.04
• Source or binary build? Binary 9.0.0

Description

• Expected behavior: Material data for primitives is saved in the world
• Actual behavior: Values are reset to grey

Steps to reproduce

1. Create a primitive (e.g. box or sphere) in the empty world.
2. Assign some colour values to the visual material
3. Save the world
4. Look at the SDF and note that the values seem to be default grey and not the colours you set
5. Load up your SDF and look at your sad grey world. 😥

Output

World before saving:

Snippet from saved SDF:

        <visual name='sphere_visual'>
          <geometry>
            <sphere>
              <radius>0.5</radius>
            </sphere>
          </geometry>
          <material>
            <ambient>0.300000012 0.300000012 0.300000012 1</ambient>
            <diffuse>0.699999988 0.699999988 0.699999988 1</diffuse>
            <specular>1 1 1 1</specular>
          </material>
        </visual>