Unexpected white color in my render

[Krion]

Hi,

 

I just have a simple scene here with some black volume trails in it and a default mantra node, but the render shows some white between them.
I can't see what's causing this..

 

Anyone any idea? 

 

Thanks in advance.  

 

Edited December 21, 2019 by Krion

[Midasssilver]

Id say, the main issue is that you don't have a material on your object. I tried rendering your object with different shaders, and a principled shader with a light reflection model gives you the same result. If you put a constant shader on the geometry, or if you remove the headlight, the white also disappears. It looks like mantra is interpreting your volume trails as poly wires, and the whites you are seeing is specular highlights from the headlight in your scene, which is why when you change to constant shading, they disappear. Hence, the importance of materials and lights when rendering