Posted-Date: Thu, 22 Apr 93 12:55:37 -0400
Date: Thu, 22 Apr 93 12:55:37 -0400
From: jgg@proforma.com (J. G. Gregory)
Message-Id: <9304221655.AA00710@proforma.com>
To: rman@aero.org
Subject: My shader is never getting called

Here is an easy one for the shader-cogniscenti:

My shader is never getting called.  I put in a printf("Boo") and it  
never gets run.

This is using the NeXT implementation of prman:

In Shape:

...
	edgeShader = [[N3DShader alloc] initWithShader:"edgeShader"];
	[self setShader:edgeShader];
...

Stopping execution after the first line shows that the shader was  
apparently found.  It knows that it is a surface shader.

The screen picture is unchanged, as expected (Interactive Renderman does  
not use custom shaders).  I print to an EPS file, and get the "standard"  
picture (that which you would get if you did nothing).  The Shape is a  
polygon, and its rendering method calls RiGeneralPolygon().  Polygons  
call shaders, don't they?

I must be forgetting to do something, but I can't figure out what.

Thanks in advance.
--J Gregory