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Almost all black render

SnowSultanSnowSultan Posts: 3,773
edited October 2020 in Blender Discussion

Does anyone have any suggestions as to what might be causing this problem? It's a Cycles rendered preview of an imported Genesis 8 Male figure (as an OBJ). Other .blend files I've made in the last few days render fine, so I assume it's something with the mesh. Thanks for any information.

cycles_problem.jpg
1225 x 1220 - 298K
Post edited by SnowSultan on

Comments

  • TheMysteryIsThePointTheMysteryIsThePoint Posts: 3,217
    edited October 2020

    @SnowSultan

    Flipped normals?

    Edit to be more helpful:

    Go to the Viewport Overlays in the upper right of the 3D Vieport, and select "Face Orientation". If it's all red instead of all blue, the normals are flipped.

    In that case, just go into edit mode for every object, and Mesh|Normals|Flip them.

    If some are flipped and others are not, I'd do a Mesh|Normals|Set from Faces

    Post edited by TheMysteryIsThePoint on
  • SnowSultanSnowSultan Posts: 3,773

    Thank you, that was the problem, but when I flipped them (from red to blue), they're still rendering all black. I'll experiment a little more (maybe it needs to be saved and reopened?), but I'm curious as to why that didn't solve the issue, as what you explained was exactly what was going on.

  • TheMysteryIsThePointTheMysteryIsThePoint Posts: 3,217
    SnowSultan said:

    Thank you, that was the problem, but when I flipped them (from red to blue), they're still rendering all black. I'll experiment a little more (maybe it needs to be saved and reopened?), but I'm curious as to why that didn't solve the issue, as what you explained was exactly what was going on.

    Strange.

    Try going to the Shader tab, and see if there is anything obviously wrong on each material. Whenever I saw an all black object while working on Sagan it was because a normal map node was referencing a non-existent UV map, and I'm not sure what your OBJ has.

  • SnowSultanSnowSultan Posts: 3,773

    I ended up deleting the OBJ file after it completely crashed Blender to the desktop upon re-importing. It was just a test, so no work lost. I'll assume something was messed up on export. Thank you very much for the useful information.

  • SnowSultanSnowSultan Posts: 3,773

    Just one more little question, I didn't want to clutter things with a brand new post for something simple. Everything I export from DAZ Studio comes into Blender rotated 90 degrees on the Y axis and facing 180 degrees the wrong way (on Z axis). Could someone tell me where you can change these values so they import as they would in Studio? Thanks.

  • felisfelis Posts: 5,737

    In the blender import menu set under Transform '-Z forward' and 'Y up'..

  • SnowSultanSnowSultan Posts: 3,773

    It's actually -Y forward and Z up, but thanks, that was where I needed to make the fixes.

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