Frank,
I'm saving your replies into my alt.nukedoc text file. Big thank you.
QUOTE(rueter @ 11/01/06, 07:20 AM) [snapback]251236[/snapback]
as far as I know there is no such thing as Channel>Expression, maybe you mean Color/Math/Expression?!
I'm referring to page 54 of the Nuke User Guide pdf.
"To apply expressions to channel values:
1. Click Channel>Expressions to insert an Expressions node at the
appropriate point in your script."
QUOTE(rueter @ 11/01/06, 07:20 AM) [snapback]251236[/snapback]
What exactly do you mean by "UV remapping"?
In this case I just rendered out a pass from Maya with the UV's of the geometry exposed in the red and green channels, allowing me to apply a texture in Nuke.
QUOTE(rueter @ 11/01/06, 07:20 AM) [snapback]251236[/snapback]
yes, you can enter expressions into almost any knob in Nuke but what to mimic Shake's DistortX you should use Nuke's STMap. Difference being that in Shake you still have to scale the values to the image size while STMap in Nuke normalizes it for you so 0,0 is the lower left corner and 1,1 is the upper right one.
If you wanted to use IDistort to achieve the same effect you get with STMap you would need quite different UVs because IDistort pulls the new pixel from coordinates relative to the current pixel position whereas STMap pulls pixels from an absolute position in the image.
Thank you for this clear description of the difference. I pasted your script and it gives the same result as STMap. It's great to see where the expressions go, even if STMap is the more straightforward option.
-Michael