There is no need for color in the Volume and Transparent dots for this mat, I'm sure I just built upon an existing mat like I always do and it was left-over, otherwise I usually have those dots black, just out of personal preference.

The sun is disabled automatically whenever you activate an HDRI to act as the light source but you can Enable the sun back on if you want to use both in the scene, no problem.

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"I want to be what I was when I wanted to be what I am now"