diamond effect

mike_sul · September 8th, 2003

slightly off topic .. i have to create an animation of rolling diamonds .. with all the refraction in its full glory and shine and highlit .. if anybody knows of a really solid techniqe of achieving real life diamond refraction effects kindly help ..

please .. its very urgent ..

Craig Ramsay · September 8th, 2003

It all depends on what software you are using etc... best place to ask would be www.cgtalk.com

Good luck!

Craig

Jennifer · September 8th, 2003

Hi,

The caustics are the sticky point. Mental ray has some very nice caustics, as does Brazil and VRay, and each would raytrace the reflections and refractions very nicely. Set the Index of Refraction to 2.42.

The PURE card would certainly render the raytracing much, much faster, especially with little lens flares and motion blur applied. But, I'm still playing with the caustics on that one.

If the diamonds are moving fast, you can probably fake the caustics with a noise or cellular map. I haven't seen examples of any renderer producing a LOT of caustics. Most underwater caustic scenes are faked.

If you are using max, then use the Reactor dynamics system to animate the rolling diamonds, or shoot them from a particle system using instanced geometry. Use gravity and deflectors to get them moving in the right direction.

How many diamonds is this? Be prepared to have some huge render times!

Have fun!

Jenni
http://render.4dArtists.com

[ September 08, 2003, 03:20 PM: Message edited by: Jennifer ]

3d-doctor · September 9th, 2003

you could fake the caustics with omni lights mapped with caustic (animated?) and a very short attentuation following the flow of gems
but i suspect the best bang will be some sparkle added via lensfx or some other form of post.......
make sure you have lightsources (3d or faked) visible in order to pick up specular reflection

September 8th, 2003	#2 (permalink)
Craig Ramsay Moderator Join Date: Aug 2002 Location: Scotland Age: 28 Posts: 739 Name: Craig Ramsay	It all depends on what software you are using etc... best place to ask would be www.cgtalk.com Good luck! Craig __________________ www.shakedigital.com

September 9th, 2003	#4 (permalink)
3d-doctor Member Join Date: Jul 2003 Location: manchester Posts: 32 Name: DAVID PINNINGTON	you could fake the caustics with omni lights mapped with caustic (animated?) and a very short attentuation following the flow of gems but i suspect the best bang will be some sparkle added via lensfx or some other form of post....... make sure you have lightsources (3d or faked) visible in order to pick up specular reflection __________________ can i have everything louder than everything else please

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September 8th, 2003	#1 (permalink)
mike_sul Member Join Date: May 2003 Location: India Posts: 37 Name: mike sullivan	slightly off topic .. i have to create an animation of rolling diamonds .. with all the refraction in its full glory and shine and highlit .. if anybody knows of a really solid techniqe of achieving real life diamond refraction effects kindly help .. please .. its very urgent ..

September 8th, 2003	#3 (permalink)
Jennifer Senior Member Join Date: Jul 2003 Location: Northern Illinois Posts: 165 Name: Jennifer O'Connor	Hi, The caustics are the sticky point. Mental ray has some very nice caustics, as does Brazil and VRay, and each would raytrace the reflections and refractions very nicely. Set the Index of Refraction to 2.42. The PURE card would certainly render the raytracing much, much faster, especially with little lens flares and motion blur applied. But, I'm still playing with the caustics on that one. If the diamonds are moving fast, you can probably fake the caustics with a noise or cellular map. I haven't seen examples of any renderer producing a LOT of caustics. Most underwater caustic scenes are faked. If you are using max, then use the Reactor dynamics system to animate the rolling diamonds, or shoot them from a particle system using instanced geometry. Use gravity and deflectors to get them moving in the right direction. How many diamonds is this? Be prepared to have some huge render times! Have fun! Jenni http://render.4dArtists.com [ September 08, 2003, 03:20 PM: Message edited by: Jennifer ]

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