Ive <"ive### [at] lilysoftorg"> wrote:
> #declare T_Floor = texture {
>    checker
>    texture {T_FloorWhite_simple}, texture {T_FloorWhite_simple}
>    rotate x*90
>    rotate y*45
>    scale 117.2/2
>    translate <-20.0, 0, 0>
> }

Ta-ding!

You know what? That stupid Trace::ComputeLightedTexture() code passes the wrong
co-ordinates to the radiosity code!

Instead of "world co-ordinates" it actually passes the co-ordinates with the
texture translations applied. Incredibly stupid error. And a one-liner to fix.
In file "trace.cpp", locate the line reading:

radiosity.ComputeAmbient(ray, *ipoint, rawnormal, layNormal, ambCol, weight *
max_Radiosity_Contribution, ticket);

replace with:

radiosity.ComputeAmbient(ray, Vector3d(isect.IPoint), rawnormal, layNormal,
ambCol, weight * max_Radiosity_Contribution, ticket);


This actually gets both the "balcony.pov" and "object_pattern.pov" scenes
perfectly back to 3.6 look.


Thanks for your help! Your scene and experiments provided essential input for
fixing this issue.

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