Hi there, I´m running through an issue with alembic geometries with vertex color sets on them.
I´m trying to move those geometries based on their vertex color as vectors and plugged to WPO. The problem is that it only recognizes positive color values. Is it a bug, or is it as it is meant to be?
Thanks in advance 
As far as I know, the color values only range from 0 to 255 (0 to 1). Someone please correct me if I’m wrong. In theory, you could use 0.5 as the midpoint. From there, subtract 0.5, multiply by two and that would give you a -1 to 1 range. You’d lose half your resolution this way, per sign direction, but it would give you what you’re looking for.
Thank you Ironic. Actually, that´s kinda what I’m doing 
What I´m trying is to bring per-vertex color info of motion vector in changing topology caches, to achieve motion blur. And right now, having only positive, 0 to 1 values is kinda dissapointing…
Thank you again!
It’s a GPU limitation. AFAIK, the color slot in the vertex structures is limited to 8-bit values that are converted to the 0.0-1.0 range when they hit the shader.
As others have said vertex colours are limited to 0-1. You could however use the TexCoord slots as those aren’t clamped and are signed.