Fix reflectance values for objects without a reflectance map #2833
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When generating reflectance values for depth cameras, visuals in the scene without a reflectance map is assigned a black material so they show up as 0s in the image output. However, it was found that the material used Gazebo/Black is not a pure black color as it has a small amount specular component and the final color is also affected by lighting. So the resulting reflectance output is non-zero. This PR creates a new
Gazebo/BlackUnlit
material that is true black and updates the reflectance generation code to use this material instead.Signed-off-by: Ian Chen ichen@osrfoundation.org