Glass objects render opaque unless a look file makes them glass

What is wrong

• An object of a glass material (material="glass_soda_lime") is drawn as an opaque coloured solid, on the default fast camera and with quality="full" alike: what stands behind a pane or inside a glass is hidden.
• Liquids are different: quality="full" draws a sim's liquids as clear liquid.

Number

• A red cube 20 cm behind a 1 cm glass pane: hidden in both looks; with the look file below the cube is seen through the pane.

Why

• By design the fast camera draws matte surfaces only. quality="full" gives every object a matte plastic of its colour: a physics material card does not choose how an object looks.

Workaround

• Give the object a glass look in a look file, which also turns on the full-material camera: look = {"materials": {"pane_glass": {"preset": "glass_clear"}}, "assign": [{"match": "pane", "material": "pane_glass"}]}, then sim.render(look=look) or alloy.camera.camera_scene(sim, look=look). match is a part of the object's name.
• Depth and segmentation images always take the glass surface (they do not see through it).

Planned fix

• Default looks by material family (glass, metal, rubber) for quality="full" (after the launch).