Render bug: strange and unknow black line shape shadow

Adjusting the camera might prevent the issue from appearing at certain angles, but it generally appears whenever the camera is moved.
I’ve checked the lighting, materials, and instantiation parameters, but I can’t find the problem.

Hi @joyjohn,

can you share a easily replicable example for us to look at the issue?
Alternatively instructions on how to reproduce this including the TouchDesigner build number and your OS.

cheers
Markus

Hi @snaut ,

Of cause,I’m using version 2023.11600 and Win11.

This is my project:

issue.toe (1008.6 KB)

Thanks!

Hi @joyjohn,

this is mostly due to the orientation of the circle geometry. The circle being a flat surface is not rotated towards the camera. You can see this by zooming in close to them. At certain positions you can see that you are looking at the circles from the side - them basically just being a line not reflecting any light - hence the dark area.

Instead of the circle geometry, use a single point (Add SOP) and convert it to a Particle per Point using the Convert SOP. Now make use of the Line MAT, disable the Draw Lines parameter and enable instead the Draw Points parameter. Playing around with the Width Near and Width Far parameters, you can adjust the look to get to a similar feel as before - minus the dark area…

cheers
Markus

1 Like

@snaut ,

You save me! The problem was caused by the circle SOP, but I successfully resolved it by changing the input source to sphere SOP.

Thank you!:star_struck: