Car glass material problem

[Geoffc]

I bought the dosch 2007 car pack with the vray materials.

Great models for the price.

 

But, about half of the cars render with black glass. Each car is a single poly mesh with a multi-sub material. I'm no wizard with materials, but the glass is identical from a car that works, to a car that doesnt. I've even tried substituting my own glass material with no fix.

 

As you can see, if I turn off shadows, you can see in. If I have shadows on but turn up the 2nd bounces, you get a glow inside.

 

If you were to view the black glass from the side, like through the windshield and out the side door, you still cannot see through, even with the shadows off.

 

I'm guessing this must be something basic, but I'm stumped and quite frustrated.

[thierrybauwens@inpix.be]

do you have something reflecting except a black background? should it be a blue sky?

[Nic H]

has the glass got thickness?

if not put a shell mod on it.

 

that might be whats wrong?

[Zdravko Barisic]

Also, you can try with de-attaching the glasses from single mesh and render again (ofcourse, with some env to reflex, like HDRI). Some vRay versions have problems with glass materials into Multi/Sub material

[JamesTaylor]

you need to give the glass a thickness... as suggested best way would be to add a shell modifier.

 

you also need to make sure that each glass material in the sub-object materials are contained in a vray blend material... there is bug re glass and subobject mats, this is the simple work around.

 

i've just converted or dosch library of cars from standard mats to vray mats and suffered the same issues you've described.

[mr. a]

Since the glass material is part of a multi-sub obj material, create a blend material and keep the current glass material as the base material.

 

Also, make sure affect shadows is checked (which it looks like you already have)..........

[Geoffc]

Thanks a bunch everyone!

 

I didn't know about the bug or vray blend issue.

So I simply created a vray blend material, added an instance of the glass material from the multi-sub to this new blend material, then instanced the blend back over the glass slot in the multi sub.

 

worked perfectly, and fortunately I didn't have to modify the mesh at all.