Why does static mesh with vertex color look torn/shredded?

Hello!

i have a model for a static mesh with vertex color in blender.
in blender the model looks fine but when i import it in ue4 it somehow looks torn or shredde.
seems like all the dark areas are missing in ue4.
how could i resolve that issue?
pictures below for clarification. first is blender, second is ue4.

Thanks,

wambo

The first picture seems to be normal inverted. But since it is ok on Blender, that might be an export isso. What format are you exporting? Did you tried to import it again in another platform?

the first picture is in blender. and not like the original model, but i could live with this. i exported as .fbx. what do you mean “normal inverted” how could i de-invert? sorry for my asking but i’m very new to this. here is a link to the original model: http://imgur.com/a/ReIcN …no black or missing triangles there

Looks like some of your tris have inverted normals like lotti already mentioned, can you select your model in Blender, go into Edit Mode, select everything with hotkey A, then use ctrl + N, to recalculate normals. If that doesn’t work, please upload a screenshot with your export settings in Blender and Import settings in Unreal.

Got it!

I have selected the model in blender, changed to from object to edit mode, then pressed ctrl + n and. after that on the lower left hand side appeared “Make Normals Consistent” with a checkbox “Inside”. clicked that, exported as fbx, imported in ue4 and everything looks fine.

Thank you for your help!