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How to get colors inside a refractive object?

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It's a shadowing issue.  The cube has a solid shadow, despite its transparent material.  If you stretch your sphere on Z so it sticks out far enough beyond the cube, you'll see it.

The cheap solution is to shut off shadow on the light (Shadow -> Shadow Type: "No Shadow"), or from the cube (note sure if that's doable in PBR Mantra).  The more expensive one would be to use caustics, but sloooow.  I'm still a noob on shading, so I don't know how you'd do caustics using Classic Shaders, but the Principled Shader has a "fake caustics" option.


Edited by jimmay
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