From: Dallas Warren (
Date: Mon Oct 30 2017 - 20:08:00 CDT


Just wanted to check if this is the expected behaviour of renderer.

Render: TachyonLOptiXInternal
Display background: gradient, top black, bottom blue2

The background of these rendered frames is solid blue (half way
between the black and blue2 of the gradient background), from top to
bottom, no gradient.

When there is BlownGlass material present, then the internal region
within the glass towards the top is black, towards the bottom is
blue2, and center is the same as the frame background.

So are seeing the display background through the glass and being
rendered as such, but the background is being rendered as a middle
colour of the display background. Image to show this can be found at

Catch ya,

Dr. Dallas Warren
Drug Delivery, Disposition and Dynamics
Monash Institute of Pharmaceutical Sciences, Monash University
381 Royal Parade, Parkville VIC 3052
When the only tool you own is a hammer, every problem begins to resemble a nail.