Problem with projection on a 3D card

#1

Hi, I’m working on my first 3D (or rather 2.5D) composition and I encountered an unexpected problem. I project a video material on a Card but it looks like the card is not big enough, there is an edge like the edge of the card:

But the card is a lot bigger than that, here you can see it in 3D space (the two cameras are projection camera and the second camera I animate):

There’s no occlusion as this card is the first on the front of the whole scene. I really spend a lot of time trying to figure out what may cause that problem, but in vain.

Anybody can help?

#2

Perhaps the card is overlapping/intersecting another card at the same zdepth? You might need to move it slightly forward or backward.

#3

Thanks!!! :slight_smile: That was the cause but I had to move my card upward, not foreward or backward (which I tried before with no success). Strange…

#4

It’s me again, because it turned out that the case is not so cut and dried… Card looked fine but when I rendered the whole sequence, there were occlusion just like before. The funny thing is, that when I rendered single frames, there were no occlusion but not in every frame. I realised that the occlusion exists in random frames. Probably it is a bug in Nuke? Anyone ever has the same problem?

#5

i’ve also seen some strange clipping errors appearing randomly

you can try to give your card more subdivisions (rows/colums), change the z blend mode or one thing i know is that huge scene scale causes this kind of problem

#6

Making card more dense resulted only with clipping showing at different frames. And all of the frames rendered with clipping, no matter if at the view they are clipped or not. Changing Z-Blend mode changed nothing. What solved the problem was changing the size of the rest of the cards to the necessary minimum (cards that made background were unnecessary big for the projection). Now everything work perfectly fine! Thanks!