DS4.20.0.2, 3Delight, Ambient Strength being ignored ? ?

3dcheapskate

Ran into this oddity over there - open Studio, create a sphere primitive, set the diffuse and ambient as shown... now spot the error

The Aux Viewport (top right) displays things correctly, but both the main preview pane and the 3Delight render look as if Ambient Strength is zero.

Does anybody else see this ?

Richard Haseltine

As I explained there, Duiffuse and Ambient are multiplied to get the "correct" behaviour of Ambient colour providing a pseudo GI - your final Ambient contribution is [ 255 * 0 , 0 * 255 , 0 * 0 ] which is black

3dcheapskate

Thanks Richard, I think that explains why the rendered sphere is black.

But it doesn't explain why the three views (main preview pane, Aux Viewport, and render) all show completely different colours ? I think that's what really confused me.

Also how do the ambient/diffuse strengths figure into that calculation for final ambient ? I think I see now - diffuse strength has nothing to do with it. It's just diffuse colour multiplied by ambient colour on a per channel basis giving the 'real' ambient colour which is then multiplied by ambient strength. 

 

 

Richard Haseltine

3dcheapskate said:

Thanks Richard, I think that explains why the rendered sphere is black.

But it doesn't explain why the three views (main preview pane, Aux Viewport, and render) all show completely different colours ? I think that's what really confused me.

Also how do the ambient/diffuse strengths figure into that calculation for final ambient ? I think I see now - diffuse strength has nothing to do with it. It's just diffuse colour multiplied by ambient colour on a per channel basis giving the 'real' ambient colour which is then multiplied by ambient strength. 

Yes.