VOLUME LIGHTS

[pdvaio]

Mental Ray Volume Lights
I Tried To Implement Jeff Patton's Tut. On Volume Lights And Beam Shader But I Am Stuck With The Following Situation.

Interior Scene Lit By Daylight System That Passes Through Tinted Glass Window Openings. To Make It More Difficult I Added 4 Photometric Spotlights That Focus Their Beams On An Evermotion Object.
I Used A Shader List In The Volume Channel Of The Mr Rendering Tab So As To Combine Two Parti Olume Shaders (one For Mr Sun And One For The Spots). I Included The Spots To The Second Parti Volume Shader And Assume That Mr Sun Uses The First One Since I Dont Know How To Assign It Just To Mr Sun!!!!! :d
The Problems Start When I Want To Add A Beam Shader To The Spotlights. Everything Gets Dark.
I Tried To Move It up in the stack, Before The Parti Volume shader, The Light Came Back But No Halo Effect Around The Spots.
Attached Thumbnails

[JeffPatton]

Instead of trying to clump all that together in one complex lump why not just render out the beam shader in it's own pass and add it in post? Or better yet, add the glow/halo effect in post instead of rendering it. Surely that would be faster & give more control.

As to why the existing volume effects darkened when you added the beam effect, maybe it's due to an energy difference between the volume & beam effect? That may or may not be the actual problem, it's just speculation on my part.

[pdvaio]

thanks jeff
i ve been away for a while
post is an option but i d like to keep things in mr (my ps skill are 0.00 or even lower)

your gnomon tuts literally rock!!!
why dont u schedule some post workshop for arch renderings?
there are lots of us who think that post is brightness and contrast !!!!!

thanks a lot
peter (pdvaio , greekbear2007)

[Nick B]

Hi guys...I need some help on volume lights and even regular lights and shadows. I would light to render these as seperate passes and add them in post. I just dont know how to render them either in alyers or as passes in maya 2010? Anyone there to help?

[TheAllusionist]

Not certain how you set up a "Render Pass" in Maya, in XSI is a command that sets up an additional set of paremeters that can be different from your current renderings and you adjust it for what you want, then when you render out, you can render the current pass or all of them together at once in different files. Not a Maya user, so can't help you out.

[rpadc2002]

In Maya
1. go to window -->> Rendering Editors -->> Render Layer Editor
2. While in Render Layer Editor
- create layer
- highlight and hold right click on that layer, then select Attributes
3. On Attibutes
- browse down then go to Render Pass Options
- there are 5 items to choose for your render pass
Beauty Pass ( default selected)
Shadow
Specular
Color
Diffuse

[nabarun]

Well Nick B I am going to post a thread under maya About your queries & some cool tutorial created by me.

Have a look around that shortly.

[spaceman]

i wish i could see it but the system told me "To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts."

[TheAllusionist]

Well you have two post now and just need three more......

[spaceman]

i hope i can reach it as soon as possible