Glass (4)

[benrickel]

A glass object ceases to have its refractiveness and reflectiveness and other glass properties when it is placed in an external environment like sky....it tends to get some opacity properties. Need someone to explain me why it happens so and how it could be corrected and also how can the glass object be assigned the light and shadow effect under the influence of the sun.
Thankyou.

[gmask]

I'm assuming that you are raytracing.
What is your light source? What type of light?
Are you using the sky environment map and to what & how is it applied?

[benrickel]

thanx gmask,
well yes the raytracing is on, as far as the lights go i had two point lights targetted on the glass object but i thought since i was going to put the glass object in an external environment(sky) and turning on the depth shadow map on the glass object will automatically be illuminated and shadowed hence i removed the two light sources. but the object turned shillouted. What i want is that the glass object be rendered as glass (with all the glass properties intact) but in the env_sky node.
Also please tell me how can i render animations and how to export into MOV, AVI file formats.

---

I am very new into MAYA just completed a couple of trivial assignments so u will have to explain me a bit more clearly. Cant wait...till you respond.
THANX AGAIN for the help.

[ahmed-1]

I don't really understand your glassproblem. I hope you have turned raytracing on BOTH on the lights and in Render Globals and on the material itself (and you have to use the correct refractive index)... But to your question on animation - check out Render Globals and the helpfiles. You CAN render directly to the AVI-format, but it is recommendable to render into numbered frames and use Maya Fusion/Premiere/After Effects or whatever to put it together.
Ciao!
/m.

The use of signatures in e-mail is a complete waste of time.

[gmask]

The depth map will not put a light source in your scene so it's no surprise that the glass came out siloquetted.

I'm still confused about where you are integrating the env_sky node. Is it connected to the glass shader? If it is and since you want to raytrace it will not be used by default by the raytracer.

If i understand what you want to do. You should apply the env_sky node to the incandescentchannel of a lambert shader applied to a large ball that encompasses the world. If you don't want the sky to rendered except for the refractions in the glass then set the primary visibility off in the attribute spread sheet editor.

You can render to uncompressed AVI movie files but only if you are rendering on one computer.. rather than a network renderer. Allthough image sequences truly are the better route. If you have premeire or after effects you can easily convert SGI,tiff or targa sequences from Maya to quicktime or avi movies. There are also some freeware programs that may be useful.

[giannis]

"how can the glass object be assigned the light and shadow effect under the influence of the sun."

i think you want the caustics effect.just go at maya rendering plug-ins(think so)an download the caustics plug in.i think there is a tutorial too.

good luck

[benrickel]

Thanx for all the replys gmask, giannis, MartinN.

But alas i stand where i was.
probably i didnt made it clear what i wanted.
Anyway.
lets begin it all over again.
What i want is any glass object placed in an env_sky node (note this is because i want a 3d sky environment) in such a way that the glass has all its refractive and reflective properties and at the same time it casts its own shadow under the influence of the sun.

Imagine a coniac glass placed under the sun on a parching dessert. I want that effect.
Well, i hope i have made myself clear this time.
And i hope i will have the answer this time.
Thanx..........................................................................................

[ibutter]

there is a tutorial that might help you with the reflections and refractions at the A|W site
http://www.aliaswavefront.com/en/Community...ract/index.html
this link might not work so go to http://www.aliaswavefront.com/en/Community/
then under downloads>shaders...in the glass section> "How to set up reflections and refractions "

this will get you on the road to reflections and refractions..... but to get real outdoor lighting is going to take some trial and error. hope this helps

ibutter