(Solved) Help with model [Mk2 Grenade]

thepantsdragon

Hello so im creating a grenade for a game im making and i have finished the low poly version of my Mk2 grenade, im using quixel suite 2 for the texturing and i wanted to see how to low poly looked in the 3do renderer, when i loaded the mesh in i notcied some of the polygons were black, ive tried a bunch of things to fix this but i cannot figure out what is causing it. 

ive checked the scale of the object, ive exported a 2013 FBX file, quixel seems to have errors for any versions newer. and ive also checked for any disconnected points and backwards polygons, ive also made sure to triangulate all the geometry on export.
Does anyone have any idea why im experiencing this problem?
I can send anyone a OBJ file of the grenade if you wish to check the mesh out to see if i did something wrong.

Stranger

Looks like your vertex normals are jacked. I would start with that.

thepantsdragon

thanks for the advice, im not sure if i did it right but it didnt seem to fix the problem
i use cinema 4d and have a plguin for vertex normals

Eric Chadwick

Check the UVs for overlaps?

thepantsdragon

I haven't created uv's for it yet I will do that when I get home and see if that fixes the issue.

kmacneil91

It looks the normals might be flipped.
There's a good 3Ds Max script for this: http://mixescript.blogspot.com/2013/03/fix-meshes.html

-Max, scripting, new script
-Ctrl+A to select all
-Ctrl+e key to apply

You can also select those faces in Maya and use Mesh Display -> reverse.

throttlekitty

kmacneil91 said:

It looks the normals might be flipped.
There's a good 3Ds Max script for this: http://mixescript.blogspot.com/2013/03/fix-meshes.html

-Max, scripting, new script
-Ctrl+A to select all
-Ctrl+e key to apply

You can also select those faces in Maya and use Mesh Display -> reverse.

Just to add on to the Maya suggestion, use Conform instead of Reverse if only some faces are flipped. It looks at the whole object and flips only the bad ones from the norm- no face selections needed.

TTools

@thepantsdragon - It will really help you (and others) resolve the issue if you enable both face normal and vertex normal visualization.
Like this so you and we can see what direction your faces are actually pointing, and whether your vertex normals are shooting off at weird tangents.


Whenever I see dark polygons like this in Maya my first gotos are:

1. Display Vertex and Face Normals and check for anomolies
2. Unlock Vertex Normals
3. Check vertex coloring - I don't know if Cinema4D supports this, but sometimes verts will get inadvertently colored black in Maya on an entire object.  That "might" be why you're seeing your parts as black in the render, but appear fairly normal in your 3d viewport.

Just a thought.  Good luck!
 

thepantsdragon

I figured out the problem, quixel suite 2 requires a certain textel density to render the mesh properly. I haven't created uv maps for it when I posted this and Once I created a proper uv map and made sure each polygon had a good texel density it solved this issue. Thank you every one for your help, hope this can help anyone Having similar problems.