#funky faces 3ds
3 messages in this thread
I'm getting some peculiar artifacts on rendering: I need to show the inside
of the computer monitor that comes with the program. I create a cylinder
about 3" dia by 8" long ( about 1/5 the sizi of the side of the monitor);
use the boolean function to punch a hole in the side of the monitor. This
creates a large no. of long, slender faces coming in from the corners of
the monitor (i.e. flat plate) as they would be a stress point. The problem
is that they render with dark shading/shadows even tho the material is the
same (beige plastic, no mapping). The result is that i have these long,
shaded triangles coming in from the corners to the side of the hole.
Ive tried remapping, welding some of the verticies, moving the lights,
everything I can think of. How can i prevent/fix this?
When you use booleans on complex objects, it's very important to "match"
the density of both objects involved. If you don't, and the boolean
operation creates long, skinny triangles, you're going to get those kinds
of rendering artifacts. Go back to your original objects and tessellate
each of them one time and try again. That ought to do it for you. If
you're getting just a _little_ shading discontinuities, you can always put
a subtle stippled map on the plastic to mitigate that (but you shouldn't
need to resort to this if you get the densities of the meshes right before
the boolean op).
– G
PS: If you need any more help with this, I'll be gone as of later tonight
for awhile. Contact Jack Powell or one of the other genius' here for help.
Thanks.
Hey Mark!,
You can sometimes salvage the aftermath of a nasty boolean adventure by
_extensive_ welding… hide the back half of the object, zoom in close, and
eliminate most of the extra zillion faces by manually welding most of the
vertices. Watch out especially for faces where all three vertices are
nearly co-linear – really ugly results with Phong shading when the light is
just right (er, wrong!). As Gary pointed out, more faces in your target
object will help but it won't always fix it.
However, it is a "hole" lot easier to make an opacity map! – all white with
a black circle in the center – and apply it appropriately. I just tried it
and could see right inside the monitor – (gasp! it's empty inside!).
Holler (well, type) if you need instructions.
JKJ ("just saying NO!" to booleans – whenever possible)