Indigo 1.1.18

Borgleader · Post by **Borgleader** » Tue Mar 31, 2009 11:43 am

Antagonist wrote:wonderfull work, love it
the only problem i have is in the setting albedo get an error message but I think thats my fault,

someone can tell me if is there a way to use caustics

congratulations again very nice work.

You don't "use" caustics per say. Its not like you click somewhere to enable it (from what I understood of the term) it's a result of your scene. Mainly from specular materials or transparent ones. Like...light going through a glass of water, the outgoing light that hits the surface on which rests the glass are the caustics (i think) someone correct me please.

Antagonist · Post by **Antagonist** » Tue Mar 31, 2009 11:50 am

im very sorry

im used to yafray(hit the caustics button and thats it), but i like more indigo now, i have no idea on how to make that efect and ill be more than happy if you point me to some good tutorials for that mather,

Thanks

Borgleader · Post by **Borgleader** » Tue Mar 31, 2009 12:20 pm

A indirect illuminated light patterns. This sort light patterns are formed when light rays reflected from or transmitted through specular surfaces ...
www.awingsoft.com/Manual/Glossary.htm

Now following that definition of caustics (found on google with define: caustic) I highly doubt theres any tutorial on "using caustics" seeing as they're a result of the use of a specular material (opaque or transparent).

To get caustics just make a sphere with a transprent specular material (ior of 1,53 and exponent of 1000) and put a surface under it.

I mean it's extremely simple just play around in your 3d app and have fun trying stuff out.

CTZn · Post by **CTZn** » Tue Mar 31, 2009 12:26 pm

Hi Antagonist

Caustics are there by default in Indigo, as Borgleader said. They are happening when light is refracted or reflected by a surface in such a way that therafter it's more focused on certain places than others. This is totally driven by the angles of light with surfaces (and also by the ior of some materials, mainly).

The smaller the light source, the sharper the caustics. Sun is an excellent alternative for that. Add curved shapes with reflective/refractive materials in your scene and you should see them projected onto surronding surfaces.

Any light passing through a transparent object (filament in a bulb) or reflected (mirror) is called a caustic light.

Borgleader · Post by **Borgleader** » Tue Mar 31, 2009 12:41 pm

Heres an example of caustics made by Stromberg (you can find the post in the "Simple Renderings" thread in the Work in progress forum.

Thank you stromberg

Antagonist · Post by **Antagonist** » Tue Mar 31, 2009 12:42 pm

im such a newbe, i started today, thank you guys for your messages you help me a lot, im trying to archive a diamond efect and i am using ligth emitters because when i use the sun everything turns blue and white, dont blame me as i said, i just started today, but actually my results are pretty desent, dont know how to place a picture, thats why i dont put one here,

thanks again

Borgleader · Post by **Borgleader** » Tue Mar 31, 2009 12:46 pm

Well either you upload it on a site like photobucket.com and insert the link between image tags (theres a button above the text box when you post) or you add it as an attachement.

please avoid huge pictures or .png because theyre big in size. try to scale them down in size and file size (.jpg is a good format for that)

Antagonist · Post by **Antagonist** » Tue Mar 31, 2009 12:56 pm

i uploaded to the gallery:

http://www.indigorenderer.com/joomla/co ... emId=49721

http://www.indigorenderer.com/joomla/co ... emId=49723

tell me what you think, in the first i place the ring near the floor and there is no caustics ior set to 2.417.

WytRaven · Post by **WytRaven** » Tue Mar 31, 2009 7:24 pm

If you are attempting to do realistic diamond then I suggest you use my material in the material database. It is as accurate as you are going to get:

http://www.indigorenderer.com/joomla/co ... temid,107/

It includes absorption and full spectrum ior (cauchy).

CTZn · Post by **CTZn** » Tue Mar 31, 2009 10:52 pm

Antagonist, I think you won't see caustics on the floor if it has no diffuse component ! Maybe I'm wrong but I believe that an opaque specular will not cast caustics as it hasn't got a diffuse component. This may also be true for phong with metal settings. Remember that when light is perfectly conducted or reflected, it remains invisible... If the mirror just dims the light... well light itself results weaker but the mirror itself will not bear any light patch (real mirrors are not perfect, not to mention dust on them etc).

Kram1032 · Post by **Kram1032** » Wed Apr 01, 2009 1:38 am

They are there but most likely too weak, due to the reflection/refraction...

Antagonist · Post by **Antagonist** » Wed Apr 01, 2009 3:59 am

thank you all, you where rigth the ground material was glass like, so the effect was very small and no diffuse component was set, Wytraven i dont now how to use the material maybe i have to copy the text to my scene file, but im trying to do an animation so it would take hours, i also try the external material in the blendigo script but it doesnt work, here is the animation http://www.youtube.com/watch?v=GwCdIvpVpyo i dont set the caustics effect, but im very happy with it

Kram1032 · Post by **Kram1032** » Wed Apr 01, 2009 4:24 am

just a hint: It's not rendered with Blendigo, that's only the exporter. It's rendered with Indigo

It's a nice animation, though you need to render it for far longer

Indigo isn't really the renderer, one would use for animations... - It is possible but in decent quality and resolution, it takes for nearly more than ever

(If you don't have a computer/farm like the ranch^^)

Antagonist · Post by **Antagonist** » Wed Apr 01, 2009 4:34 am

you read everything dont you

, i changed blendigo to indigo ok, i know indigo its not designed for animations(well maybe with a render farm) was only trying it, i render each frame for 4 minutes, like 5-7 hours

, but i like it, love indigo

Kram1032 · Post by **Kram1032** » Wed Apr 01, 2009 4:36 am

well, such a short comment hits the eye ;P

Indigo 1.1.18

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