Improvements to uvpointcloud

[josephsil]

I made two edits to the uvpointcloud sop that i believe are bug fixes --

1. Changing how the grid is created so that the points are centered in each pixel
2. Adding a divide sop to triangulate the mesh before raycasting which prevents the points from being offset along the normals when transformed with @_rest (not sure why.)

Before and after of the grid change below, pictured with 128x128, with a tiling texture showing one square per pixel. Note that in the before, points start in one corner at 0.0, 0.0 in uv space, and gradually drift as they approach the center. In the after, points are always at the center of each pixel.

I didn't capture a screenshot of the divide change, but the issue it fixes is clearly visible in the screenshots around the center left (5, f, g, 6, 7, g) where that quad's points all were offset slightly behind the mesh.

before

after

(ps: qlib is super useful to me, thanks a ton for creating and maintaining it)

[johnnyquest]

Thanks @JosephSilvermanArt this is great, I'll check it out soon! One question -- I see on your screenshots that you're using a non-commercial edition, did you save over the otls in non-commercial? That might affect things

[josephsil]

@johnnyquest Ah, yep, that totally slipped my mind. I'll make a new commit from my work computer later today.

[josephsil]

Should be all set now!

[johnnyquest]

Cool thanks, I'll check it out soon