Could anybody help with the water shader black problem once more=]

[haodongwang]

Hi,

I'm using vray for maya2013 in order to render water droplets,

the mesh was generated by realflow,

I use default vray sky and vray sun, and a spot light,

The problem is the black area in some droplets,

I try to change the camera angle, they are still there~

seems that the problem is form the refraction layer~

 

Thanks alot~~

[Corey Beaulieu]

I don't use Maya, but the first thing I would consider in Max would be the Max Depth of Refraction on the material. The default in Max is 5, but perhaps it's lower in Maya or maybe just that Real Flow has given you a mesh that is more complex than a one side in, one side out.

 

Just a thought.

[haodongwang]

Thanks for the advice... but I tried to increase the Max depth of the Refraction to 120(The default is 8)... it's still black...maybe there is something wrong with the realflow mesh...

[Francisco Penaloza]

To me it seems the light is not going though the mesh, first check the normals of the drops, then to the water drop material give a height IOR but lower Fresnel on refraction, I guess Reflection 2.2 and refraction 1.5 should get you a good starting point, also in refraction check the box of affect shadows. Be sure no values it is in the fog and also remember the mesh will be single side but since the drops are small it may be worth to check to double side.

[haodongwang]

Thanks Francisco Penaloza~

The 'affect shadows' really helps a lot... but the black is still there... just not that dark...

I checked the normals again...The interesting thing is that Even though they all showing that they are facing the right direction, I mean...outward... but some of them are actually been reversed... I think...

cause I rendered a close up, there is no transparence at all for those ones(I tried both double and single side).

I selected some of the faces, reversed them , and the black turns to transparent...

But it's really a big deal to find out which face is reversed and which is not...

I'm trying to rebuild the face in realflow... good luck to me~lol~