smr_VIZ Posted November 12, 2008 Share Posted November 12, 2008 In autocad, to save the memory, I modeled a face for a glass. Then I applied a glass mat.( with ref. set to light grey) to it in MAX. Now here comes the trouble. Some glasses' normal seems being changed. I couldn't see the glass mat. anymore. If I model in solid, problem dismissed. I wonder if it is the video card driver cause this issue? Link to comment Share on other sites More sharing options...
Victor Erthal Posted November 12, 2008 Share Posted November 12, 2008 you mean in the viewport or the render? If you can't see it in the viewport is simply a display setting. All you have to do is to select the glass object and right click - object properties and disable the "backface culling" option if it does not show on the render, you should check in your vray material - options tab - double sided. One important tip: if you plan on using single faces for the glass, you might end up with incorrect refractions. basically the rays go in the glass and since htey cant find "the ohter end" there is a very strong lens effect that gives you a very weird refraction. to fix it you can one of the following things: a- set you IOR to 1 in you material b- apply a shell modifier to whatever you think is the thickness of the glass. hope this helps. Link to comment Share on other sites More sharing options...
smr_VIZ Posted November 13, 2008 Author Share Posted November 13, 2008 \if it does not show on the render, you should check in your vray material - options tab - double sided. One important tip: if you plan on using single faces for the glass, you might end up with incorrect refractions. basically the rays go in the glass and since htey cant find "the ohter end" there is a very strong lens effect that gives you a very weird refraction. to fix it you can one of the following things: a- set you IOR to 1 in you material b- apply a shell modifier to whatever you think is the thickness of the glass. hope this helps. I guess you would always model a solid for the Glass object then? The optionA won't give me the correct rendering effects for the glass. Option b won't reduce the rendering time, I suppose? It seems MentalRay don't have such problems? Link to comment Share on other sites More sharing options...
Victor Erthal Posted November 13, 2008 Share Posted November 13, 2008 it won't affect you rendertime very significantly. Mental ray has that issue too. the difference is that mental ray has a solid glass and a flat glass material for those situations, wich would be basically the same thing as setting up an IOR of 1. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now