problems with (foo == bar) ? foo : bar ;

[rconstruct]

Hi

I'm working in a glass shader, and i'm getting some strange errors. Since raytracing is expensive, i'm restricting the shading (and samples) to apropriate raylevels, and i'm using lots of binary evaluations ( (foo == bar) ? foo : bar; ) instead of if/else's. Can anyone confirm if this is the case, pixie not supporting these expressions? And if so, is there a timetable to implement this ?
Thanks.

Best regards

[Moritz Moeller]

Implicit if's are not part of the RenderMan standard. Some renderers (e.g. PRMan & 3Delight) support them but this is not RenderMan-compliant any more.
And honestly, this is just syntactical sugar for explicit if's. So just write an explicit if like so:

float baz;
if( foo == bar ) baz = foo; else baz = bar;
// use baz

:-)

.mm

[rconstruct]

Hi

Will do, i just asked about this because i'm working on a couple of heavy shaders (glass, and coated glass & coated metals), particularly the glass one is quite heavy, and i noticed that at least 3delight (and the air demo) are faster when using binary conditionals than if/else, but no problem, i can just as well use if/else, overall the difference altough exists, at least in those 2 renderers, is negligible compared to other things.
Thanks for the swift reply anyway.

Best regards