Texture3D from blending (or a better way to do thumbnails)?

General TouchDesigner Discussion
1

Hi all,
I’m building a system for jumping through cues in a long video source. I thought it would be good to build thumbnails out of a texture3D TOP and a geo instancer holding a single 16x9 rectangle.
A table DAT feeds the instancer with one row for every thumbnail, and columns holding position data and which index of the tex3D to use as a texture.

Everything works as expected except that the index has to be expressed in W coordinates normalized to 0-1 - so instead of nice clean integers I have to calculate some fractional value and I end up getting a blend between two frames.

Is there a better way to do all this?

This is part of a larger project I can’t post, but if my question need clarification I can make a sample project.

Thanks,
–David

2

Tex3D TOP has two modes. Use 2D array mode for integer indexing derivative.ca/wiki088/index … ure_3D_TOP

3

“The W texture coordinate is non-normalized.”
Of course!

Thanks so much