Alpha Channel

Started by Leadwerks, September 24, 2015, 10:36:19 am

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Is there any way to save out an alpha channel of the sky renders?  This would provide a transparency value to use when rendering a real-time sun behind the clouds.  The alpha channel would look similar to a render with a pure black atmosphere, although this isn't exactly right, since the dark cloud undersides would appear more transparent.

Is there any way to save out the alpha channel automatically?


This ugly mockup shows the basic idea.


September 24, 2015, 06:29:00 pm #2 Last Edit: September 24, 2015, 06:48:49 pm by Oshyan
If you disable the Atmosphere node you'll get something quite like a cloud alpha, however it won't fade away at the horizon. If that's something you need there is a Cloud Alpha render element available in Terragen 3 Professional (with or without animation) which gives you exactly that.

Given your skybox seam issue in the other thread and this, it seems like upgrading to Pro might be necessary for your needs and workflow.

- Oshyan