RenderingShadow Issues and Geometry Glitches with A. Klemm's Voyager

Tiberius Jim

I'm attempting to create an animation of a Voyager taking off from near a planet's surface and flying out into orbit in one shot in Blender 4.0. I found a great planet model on CGTrader that is made for this purpose and am now attempting to animate A. Klemm's Voyager flying from the surface to orbit. However, once I bring it into the planet scene (or I bring the planet into the ship's scene) things get weird. First, the model starts to get somewhat fragmented (ie. weird borders around the windows and things just start to get very, well, glitchy. And the shadows start to look odd, like you can see the model's mesh through them. I've attempted to figure out what's causing this to no avail.

I've included renders to show what it's looking like + what it should look like. The first image shows the problems with the shadows and model fragmentation. The second is zoomed in, and highlighted in red are the shadow issues, and in green are the fragmentation. The light shouldn't be bleeding out through those panels.

The second shows the ship in a scene by itself and lit similarly. This is how it should look with no shadow or fragmentation problems. I basically need the ship to look like the second image but in the same shot as the planet from the first image. Any ideas on what could cause these issues would be appreciated. FYI I am using Blender 4.0 and rendering in Cycles. I'm still fairly new to Blender so there may be something basic I am missing, and appreciate any help.

backstept

My first guess is that it might have something to do with camera clipping distance. I assume you had to change the clipping end distance with the planet in the scene, but if the default is still 0.01m it might introduce some z fighting or depth buffer glitches, at least in viewport. I haven't seen an issue like this in renders before so I can't be certain.

Coward

I think I've figured out what's causing this. There appears to be an issue caused by the camera being too far away from the world origin. The further the camera is the more render issues appear - I managed to reproduce that wireframe artifact on the side hull by moving the ship and camera 100km on both the x and y axis.

I'm not sure on the best way to fix this, apart from ensuring the camera doesn't move too far from the world origin, which could be done by either moving the planet instead of the camera, or shrinking everything so the camera doesn't have to move as far, but this may end up causing other issues (like clipping, texture or lighting issues).

Tiberius Jim

That does make sense since the problem does get worse the more I move the camera away from its starting point. Not sure how to fix that either but at least knowing the cause may help me research a solution. Thanks for the help!