# How to get rid of black triangles and artefacts?

for the past few days, I've been struggling against artifacts problems with a mesh.

I used the boolean modifier on this following cube :

After applying the "Difference Operation", here is the result :

At first, It looks great, but if I zoom in, you will notice this problem :

I have tried to use the Edge Split modifier, It did nothing.

I also tried to remove doubles, and this happened :

Not only It accentuated the problem, but It also created some holes (as you can see at the bottom left of the picture). My guess is that some faces are overlapping. This problem happens with all the rounded edges. Do you guys have any tip on how to solve this ?

• blender.stackexchange.com/questions/21747/… – Duarte Farrajota Ramos May 23 '19 at 12:21
• You can use a smaller Overlapping Threshold for about 1e-10 to moderate that Overlapping behavior. But it is hard to get rid of it since the algorithm use in blender will generate this restriction. – Hikariztw May 23 '19 at 12:42
• Thanks for your answers... Changing the overlapping with a smaller value didn't change anything (Only changes if I increase it), neither by increasing a bit the clip start value. It is not a problem with the view, but with the geometry. I think there is nothing I can do about it... Seems like the Boolean modifier is not viable with cylinders that has a subsurf modifier. – Zedce May 23 '19 at 13:02
• It looks to me like you have overlapping geometry causing z-fighting. Avoid booleans and use proper modeling. – cegaton May 23 '19 at 14:43
• If it is a z-fighting issue, change the view clip start and end to relative close value might help a little bit. – Hikariztw May 23 '19 at 15:51