[Gary Bidwell]

Hi all,

we get a strong white edge to the default carpaint which comes from the Grazing layer.

Is this a realistic property of carpaint or a setting for users to tweak per scene?

Cheers,

Steve

[tom]

What color is your car paint? Could you send screenshots?

[Gary Bidwell]

Don't seem to be able to post images to this thread.

The white line appears to be coming from the white floor.

Oh, I have upped the Nd on the TopCoat, to up the reflectivity. This probably isn't helping.

Cheers,

Steve

[tom]

In order to post images, you need to upload images to free image hosting services such as imageshack.us etc. and insert direct links between [img]...[/img] tags here. It's hard to say something accurate without seeing your settings and output.

[Gary Bidwell]

[tom]

And settings?

[Gary Bidwell]

I've changed the top coat Nd from 1.2 to 1.4 to get more reflection at Reflectance 0 but this brings the edge up too high.

[Chris Krüger]

What color does you floor material have? In RGB or HSV values that is.

Chris.

[tom]

I've changed the top coat Nd from 1.2 to 1.4 to get more reflection at Reflectance 0 but this brings the edge up too high.

For more frontal reflection, you need to turn off Force Fresnel and play with Reflectance values instead.

[Gary Bidwell]

The floor is off white, 0.950 and reflectance 90 is 0.975.

I'll look at switching off the Force Fresnel and post back. Cheers for the info.

[Gary Bidwell]

I've got rid of the black line by putting the Reflectance 90 to black, although I thought the reflectance 90 should always be brighter than Reflectance 0?

[tom]

Very sorry for asking over and over but, could you please show the *complete* material setup?

[Gary Bidwell]

No worries.
Here's a complete breakdown of the shader - all based off of the default carpaint.







the last image isn't too bad with a grey Reflectance 90

[tom]

Actually, the problem is about additive blending as it's not taking care of the energy overflow. So, when you have a topcoat with high reflectance and/or high Nd, it causes overly high reflectance at grazing angles. Try normal blending and feel free to keep your reflectance or Nd as high as you need.

[Gary Bidwell]

there's still a strong white line using the default carpaint and changing both blending modes of the Top Coat and Grazing to normal