brokenpixel Posted March 18, 2008 Share Posted March 18, 2008 Hello all I am having a problem with the new Houdini 9 glass material. In my testing I have found that it is not transparent and I cannot see other objects through objects that are shaded with it. Perhaps I am unaware of the capabilities of this material or am not setting up certain parameters correctly. If anyone can shed some light on this issue I would be greatly appreciative ! Render and .hip file attached. Thanks in advance for any and all assistance. Scott Pagano houdini_glass_03.hip Quote Link to comment Share on other sites More sharing options...
aracid Posted March 18, 2008 Share Posted March 18, 2008 Hey Scott What is happening here is due to internal refraction, try setting the IOR too 1 and your glass ball will be transparent. So from your image, it is in fact producing the right effect, because the default IOR isnt 1. what is happening is due to the ray that is traced and bent based on your internal refraction that distorts what is behind the object. hope this helps brian Quote Link to comment Share on other sites More sharing options...
brokenpixel Posted March 19, 2008 Author Share Posted March 19, 2008 Hello Brian Thank you for your help. I can't find the parameter field in the Glass material to change the IOR. The old Vex Glass SHOP has a slider for this - but not the new H9 Glass material. Very likely I'm missing something right in front of me... Any ideas ? Scott Quote Link to comment Share on other sites More sharing options...
edward Posted March 19, 2008 Share Posted March 19, 2008 IOR = Index of Refraction Quote Link to comment Share on other sites More sharing options...
brokenpixel Posted March 19, 2008 Author Share Posted March 19, 2008 Ah ha ! Thanks Edward. I had looked right over it on the Ray Trace tab... Quote Link to comment Share on other sites More sharing options...
michael Posted March 19, 2008 Share Posted March 19, 2008 http://hyperphysics.phy-astr.gsu.edu/Hbase/tables/indrf.html 1.0 is vacuum try 1.3 - 1.5 Quote Link to comment Share on other sites More sharing options...
Jason Posted March 19, 2008 Share Posted March 19, 2008 1.0 is vacuum 1.0 is air, actually; assuming you are in air. Its a relative index of refraction, meaning that 1.0 indicates you are passing into a medium of the same density - air-to-air, vacuum-to-vacuum. Quote Link to comment Share on other sites More sharing options...
labuzz Posted March 19, 2008 Share Posted March 19, 2008 BTW guys, is there a default material that can handle a transparency map? Quote Link to comment Share on other sites More sharing options...
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