[Sidefx-houdini-list] HDK COP

Mark Alexander malexander at sidefx.com
Fri Feb 16 16:10:10 EST 2007

>  i found "tiles->myX1" and "tiles->myY1" that is the Xmin and Ymin for the tile, but couldn't find the X and Y of the current pixel it is processing.

You're processing a lot of pixels at once, in one tile, containing from 
1-4 channels. I often use:

int x, y, idx;

idx = 0;
for(y = tiles->myY1; y<=tiles->myY2; y++)
   for(x = tiles->myX1; x<=tiles->myX2; x++, idx++)
       data[idx] = /somevalue/;  // at x,y

You'll have to do this once for each channel; or, you can process every 
channel inside that loop (often easier to process RGB all at once).


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