Dark Edges on Object

[PhilW]

I am using the demo version of Octane, saved an OBJ of a figure from Carrara and loaded it into Octane. I am starting to find my way around, but on this figure I always seem to get a dark edge (see right of the head in the screen capture). This is not a lighting issue, if I rotate around the object, the dark area stays on the edges, from whichever angle I am viewing from.

Any ideas what is causing this and how I can make it go away? I am using an HDRI Environment map for lighting.

[FooZe]

Hi Phil,

Excessive bump mapping can sometimes cause black problems on edges, but I've never seen it cause it like this.
There must be something else going on.
Are you happy/allowed to post a zip of the scene?
The next best thing would be screenshots of the skin material setup.

PS: there is a 1.20 demo out now http://render.otoy.com/downloads.php

Thanks
Chris.

[face_off]

There is a transparent eyebrow geometry item which is causing a "self-shadow" issue with the forehead geometry, so set rayepsilon to 0 to get around this. And the bump value looks too high.

Paul

[PhilW]

Thanks for the suggestions - I have updated the Demo to 1.2 and also loaded an updated driver for my graphics card. The "dark edges" issues seems to have gone away, but I am now getting the artifacting on the arm as in the attached screen grab. Even reducing the bump to zero does not cure this. Again, all ideas welcomed - and thanks for the help so far.

[face_off]

Could be too close to the camera - so check your camera nearClipDepth. If the scene is coming from Poser, try the Poser plugin demo.

Paul

[PhilW]

No its not the camera clip depth, it still appears when I move the camera away. I am exporting the OBJ from Carrara - so much looking forward to the plugin for Carrara becoming available! I think it may have something to do with the geometry, although I checked the OBJ and it looks OK to me. Not to worry, just playing around trying to get a feel for it at the moment.

[face_off]

You can use the deep_channel_kernel kernel and there are about 7 different modes which help analyse geometry issues.

Paul