# tips for curved glass? **URL:** \ **Category:** General\ **Created:** [June 17, 2005, 12:57pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983 "2005-06-17T12:57:15Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![tricky](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tricky/32/56653_2.png) [@tricky](https://forums.chaos.com/u/tricky)\ **Post date:** [June 17, 2005, 12:57pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/1 "2005-06-17T12:57:15Z")
I am \*trying\* to get reasonable render times for an atrium that is made up in the most part of curved glass. Render times go through the roof and somewhere into outer space. The geometry is imported from AutoCAD, and the glass itself is 10mm thick. Does anyone have any good tips/settings for getting good looking renders out in a reasonable time? Its for an animation (720x404) and I really don’t want the times to be above 15-20min per frame. ---
**Author:** ![Da\_elf](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/da_elf/32/44038_2.png) [@Da\_elf](https://forums.chaos.com/u/Da_elf)\ **Post date:** [June 17, 2005, 1:44pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/2 "2005-06-17T13:44:22Z")
i never use imported geometry from autocad. my clients who are the architects usually make some of the most messy drawing ive ever seen in autocad or whatever other program they use usually one of the things i find with thin glass when its bent like for car windows is the ior really gets messed up i like to use 1.001 for ior of glass refraction and keep the usual 1.54 for the reflection ior ---
**Author:** ![tricky](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tricky/32/56653_2.png) [@tricky](https://forums.chaos.com/u/tricky)\ **Post date:** [June 17, 2005, 2:38pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/3 "2005-06-17T14:38:00Z")
I’ll have a look at that. We very (very) rarely use the geometry straight from architects as we have found the same problems - poor naming, poor geometry, inaccuracies etc. This is stuff we have modelled, so we know it is geometrically correct. ---
**Author:** ![tricky](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tricky/32/56653_2.png) [@tricky](https://forums.chaos.com/u/tricky)\ **Post date:** [June 17, 2005, 2:39pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/4 "2005-06-17T14:39:32Z")
Hange on a sec…how do you have a different IOR for reflection? In my version, IOR is for refraction only. ---
**Author:** ![percydaman](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/percydaman/32/42214_2.png) [@percydaman](https://forums.chaos.com/u/percydaman)\ **Post date:** [June 17, 2005, 2:50pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/5 "2005-06-17T14:50:13Z")
nope…thats why where is a IOR spinner for reflection in the vray material rollout. ---
**Author:** ![Da\_elf](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/da_elf/32/44038_2.png) [@Da\_elf](https://forums.chaos.com/u/Da_elf)\ **Post date:** [June 17, 2005, 3:01pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/6 "2005-06-17T15:01:24Z")
well. it depends on what version your using ---
**Author:** ![flipside](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/flipside/32/12787_2.png) [@flipside](https://forums.chaos.com/u/flipside)\ **Post date:** [June 17, 2005, 3:44pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/7 "2005-06-17T15:44:11Z")
Wat is taking long, the IR map calculation or the actual rendering of the image? ---
**Author:** ![tricky](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tricky/32/56653_2.png) [@tricky](https://forums.chaos.com/u/tricky)\ **Post date:** [June 17, 2005, 4:14pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/8 "2005-06-17T16:14:50Z")
The actual rendering is taking the time - calculation is pretty nippy. BTW, I am using the old-faithful version 1.09.03r, so that may explain some ‘missing features’ ---
**Author:** ![tricky](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tricky/32/56653_2.png) [@tricky](https://forums.chaos.com/u/tricky)\ **Post date:** [June 20, 2005, 8:13am UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/9 "2005-06-20T08:13:32Z")
any tips at all, or is it just a slow thing fullstop. ---
**Author:** ![UBIKmh](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/ubikmh/32/57770_2.png) [@UBIKmh](https://forums.chaos.com/u/UBIKmh)\ **Post date:** [June 20, 2005, 9:17am UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/10 "2005-06-20T09:17:48Z")
What’s your reflection depth setting. By default it’s probably 5 but you might be able to pull off a setting of 3. Same goes for your refraction. This could save a lot of time. For stills it might not work because you will miss out some reflection in reflection, but maybe you won’t notice these things in an animation. Marc ---
**Author:** ![olitech](https://avatars.discourse-cdn.com/v4/letter/o/ed655f/32.png) [@olitech](https://forums.chaos.com/u/olitech)\ **Post date:** [June 20, 2005, 1:45pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/11 "2005-06-20T13:45:30Z")
Tricky, put a falloff in your reflection slot…use the fresnel IOR ---
**Author:** ![olitech](https://avatars.discourse-cdn.com/v4/letter/o/ed655f/32.png) [@olitech](https://forums.chaos.com/u/olitech)\ **Post date:** [June 20, 2005, 1:46pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/12 "2005-06-20T13:46:45Z")
Tricky, put a falloff in your reflection slot…use the fresnel IOR ---
**Author:** ![flipside](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/flipside/32/12787_2.png) [@flipside](https://forums.chaos.com/u/flipside)\ **Post date:** [June 20, 2005, 7:34pm UTC](https://forums.chaos.com/t/tips-for-curved-glass/7983/13 "2005-06-20T19:34:12Z")
Hi Tricky, Can you show the glass material settings you are using. Make sure you use pure black diffuse and pure white refraction color. If you change the refraction to for example very light grey (245) and the diffuse to some color for example, rendertimes will increase dramatically, especially if you have lots of reflection/refration bounces.