Hey, what could be causing these thin dark lines? It only happens on particles systems that are using a mesh renderer and it seems to be happening near the edge of the mesh. Plus, it only shows up in Game View, Scene View is fine.
I was suspicious of UV stuff and went back to Blender to shrink a little bit the UVs of the mesh…which fixed all of them, BUT this one.
How does your texture looks like ? If it’s bleeding, you can fix that by changing your texture wrap mode to clamp or mirror. If you need to tile the texture on a specific axis, you can specify the wrap mode separately on each axes with “Per-Axis” mode.
Hi! Thanks for coming by. I’m not on my PC right now so I can’t get the texture and post it here, otherwise I would. Though I know it’s not bleeding and I’ve set it to Clamp already, because I want to have it scrolling over Lifetime, coming from “outside” the mesh by using Custom Vertex Streams.
This might be caused by the mip level, as they sometimes cause aliasing errors in sharp angles. You could try forcing the highest mip in the shader on the texture2D and see if the problem still persists.
There are multiple solutions to that then.
Mip Maps are LODs for textures. These will be generated automatically in most engines. They are useful to make some GPU calculations faster, as it doesn’t need to sample a whole big texture if the object is further away from the camera, but just a smaller one (eg, instead of 512x512 it uses a mip level with 64x64). In most cases, it also mitigates aliasing, but in some edge cases create visual aliasing themselves.
As it is produced automatically, there of course can be some errors, as it reduces pixels. That is why, often for albedo/diffuse textures, you will see that on textures the last pixel on the edge of an UV is repeated until the edge of the texture.
But the tradeoff of having the mip is, that it fills out more texture memory (~30% more) as new information is generated.
I hope this solves the problem!
Sorry for the late reply, but having recently faced a similar problem and only finding this instance of the visual artifact being mentioned online, I had to get back somehow. Don’t know if this is the be-all end-all solution though, but after brute forcing the problem and messing with every option, the one that did it for me was changing the material settings in the shader graph from unlit to lit. Hope this helps anyone else facing the same dreaded black lines!
