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How do you get glass to cast shadows?
Please note that the following technical constraints apply: A PureGlass Material will only cast shadows when it is lit up by the sun. Artificial light sources will not make objects with PureGlass Materials cast shadows. The standard Glass Material cannot cast shadows at all.
Why is this glass cycles material casting solid shadows?
You did have Transparent Shadows disabled in the Material Settings. Once enabled, you can use the Light Path Node’s Is Shadow Ray to Select between the Glass and Transparency shaders to achieve this effect. You need to put a solidify modifier on your glass pieces. Or make them thick otherwise.
Is there a way to cast shadows on a sliding door?
Unfortunately, there is still no sun streaming through the sliding door. The problem is that translucent surfaces default to casting no shadows in rasterization, but they do default to casting shadows in ray tracing. Truthfully, they should cast some amount of shadow, but UE4 does not yet support partial coverage shadows.
Why are there no shadows in ray traced?
Several more shadows are cast in the ray-traced version, helping to ground things better. However, the sunlight streaming in the window and hitting the floor is suspiciously missing. The reflection on the wood floor is visible, but not the diffuse shading from the sun directly striking it.
How are glass surfaces treated as opaque by shadow rays?
Neither GlassBSDF nor PrincipledBSDF (with transmission) count as transparent surfaces to shadow rays. This results in glass surfaces casting shadows like fully opaque objects, even when the render option for transparent shadows is enabled. In my opinion this radically compromises realism by default and is an incorrect behavior of light rays.
Why does clear glass have shadows on it?
Glass – even perfectly clear glass – will cast shadows because it’s refracting light in other directions. Where those refractions are focused will be brighter and the other areas will be darker. There’s give and there’s take.