LightCoMP: Projector Map issues

General TouchDesigner Discussion
1

Hey,

I want to render a scene from a Light’s point of view and then reproject the rendered image from that same light onto the geo. Simple enough, but the images don’t line up. I need to adjust the aspect ration of the rendered/backprojected image, i.e.“/project2/render2” needs to be set to aspect ratio of 1.159/1

Can anyone tell me why that is? Is it a bug?

cheers
Akeem
why.toe (7.02 KB)

2

Something must be up with the scale parameter on the light - try changing it to 10. Works fine after.

cheers
Keith
why-3.toe (7.18 KB)

3

Hey Achim,
The issue is that ‘Aspect Correct Projection’ is off by default in the Light COMP. This is needed to maximize the pixels usage in a shadow map, which is the more often used case for using a light as a camera.

4

Nice. Many thanks Malcolm

5

Hi Guys!

I’m performing the same issues using a camera made in CamSchnapper.

I’ve tried to use a light as a virtual projector, and it works, using perspective projection from the CamCOMP and setting the same angle in LightCOMP.

Now I have a camera with a custom projection matrix done in CamSchnapper, but even if i put the same custom matrix in the LightCOMP I can’t obtain a decent remap.

I think is because i can’t set it the Light parameter.

In the attached file I have put the example of the two situations.

Any suggestions?
RemapTest.toe (16.3 KB)

6

Hey,
You are correct the light projector ignores the values on the ‘View’ page currently. It simply uses a Horizontal FOV projection right now.

7

Build 32100 or later of 088 will have a new option for projector maps to use the projection settings from the View page instead of the simple Horizontal FOV that the projector map currently uses.