global illumination

[Anonymous]

would some one beable to write some instructions and how to illuminate a simple room with a large window using glabal illumation, I havent used mental ray much before and I dont know where to start.

thanks

Zoe

[Anonymous]

would some one beable to write some instructions and how to illuminate a simple room with a large window using glabal illumation, I havent used mental ray much before and I dont know where to start.

thanks

Zoe

[Anonymous]

Hi
I hope this will help

http://www.treddi.com/forum/index.php?showtopic=8436

Rergards

[Anonymous]

Hi
I hope this will help

http://www.treddi.com/forum/index.php?showtopic=8436

Rergards

[Anonymous]

autodesk has a podcast of something similar using the mia_portal_light shader....in mental ray...and it is very easy.....
1. given an enclosed room with a window, place an area light covering your window.
1a. you can also setup an Environment >Physical Sun and Sky to light the exterior.
2. access the attribute editor for the area light and open the mental ray tab.
3. enable Use Light Shape and make sure Visible is on.
4. go down to Custom Shaders and click on the Light Shader map button on the far right.
5. select the Mia_portal_light on the mental ray tab>MentalRay Lights.
6. add the same shader created above to the Photon Emitter slot.
7. in the attribute editor for the portal light shader increase Intensity Multiplier to 100 or so.

it will get you moving in the right direction....you did say you were new to mr didn't you?

[Anonymous]

autodesk has a podcast of something similar using the mia_portal_light shader....in mental ray...and it is very easy.....
1. given an enclosed room with a window, place an area light covering your window.
1a. you can also setup an Environment >Physical Sun and Sky to light the exterior.
2. access the attribute editor for the area light and open the mental ray tab.
3. enable Use Light Shape and make sure Visible is on.
4. go down to Custom Shaders and click on the Light Shader map button on the far right.
5. select the Mia_portal_light on the mental ray tab>MentalRay Lights.
6. add the same shader created above to the Photon Emitter slot.
7. in the attribute editor for the portal light shader increase Intensity Multiplier to 100 or so.

it will get you moving in the right direction....you did say you were new to mr didn't you?

[Anonymous]

Thanks alot I'll give that a try, yes I am, I've never had much opportunity to use it and theres not much free tutorials etc on the internet, would you recommend any books or anything?

Zoe

[Anonymous]

Thanks alot I'll give that a try, yes I am, I've never had much opportunity to use it and theres not much free tutorials etc on the internet, would you recommend any books or anything?

Zoe

[Anonymous]

I have done as you said and have made the area light and accessed its attributes (as you can see). I have included an image of the mental ray tab, which of these settings am I supposed to use? Also is the environment menu at the top and which set will I find it under (i.e. animation, rendering) as I cant see it.

Thank you!!

Zoe

414_AtAXcDjTxBpnbIUDD16b.psd

[Anonymous]

I have done as you said and have made the area light and accessed its attributes (as you can see). I have included an image of the mental ray tab, which of these settings am I supposed to use? Also is the environment menu at the top and which set will I find it under (i.e. animation, rendering) as I cant see it.

Thank you!!

Zoe

414_AtAXcDjTxBpnbIUDD16b.psd

[Anonymous]

I am on version 2008....

[Anonymous]

I am on version 2008....

[Anonymous]

I've got 7 so I assume thats why I dont have the same settings, is there a way to achieve this in 7??? I dont have the mr light option either.

thank you!!

Zoe

[Anonymous]

I've got 7 so I assume thats why I dont have the same settings, is there a way to achieve this in 7??? I dont have the mr light option either.

thank you!!

Zoe

[Anonymous]

???

[Anonymous]

???

[Anonymous]

I have a quick question on the Portal Light. If I turn Visibility on the portal light blocks the view outside the window from in the room. I understand that turning visibility on 'blocks' Final Gather from having to perform unnecessary calculations but how do you still achieve this without obscuring the vew outside.

Hope that makes sense

[Anonymous]

I have a quick question on the Portal Light. If I turn Visibility on the portal light blocks the view outside the window from in the room. I understand that turning visibility on 'blocks' Final Gather from having to perform unnecessary calculations but how do you still achieve this without obscuring the vew outside.

Hope that makes sense

[Anonymous]

........it's just the way the podcast showed it.....so do what works for your scene....

[Anonymous]

........it's just the way the podcast showed it.....so do what works for your scene....

[Anonymous]

Where do I find the podcast?

Zoee

[Anonymous]

Where do I find the podcast?

Zoee

[Anonymous]

http://www.alias.com/glb/eng/support/maya/podcasts/index.jsp
at the subscription center....
but I think you have to be a subscriber to one of the memberships like gold or platimum....not sure, exactly......they have an archive of past ones....and a new one weekly.

[Anonymous]

http://www.alias.com/glb/eng/support/maya/podcasts/index.jsp
at the subscription center....
but I think you have to be a subscriber to one of the memberships like gold or platimum....not sure, exactly......they have an archive of past ones....and a new one weekly.

[Anonymous]

I've got 7 so I assume thats why I dont have the same settings, is there a way to achieve this in 7??? I dont have the mr light option either.

thank you!!

Zoe

Hello
In 7 you can use a point light and convert to a mental ray area light with a square projection.
To simulate the light coming from the sky, plug a mib_cie_d shader to the light color.

[Anonymous]

I've got 7 so I assume thats why I dont have the same settings, is there a way to achieve this in 7??? I dont have the mr light option either.

thank you!!

Zoe

Hello
In 7 you can use a point light and convert to a mental ray area light with a square projection.
To simulate the light coming from the sky, plug a mib_cie_d shader to the light color.

[dangerweenie]

autodesk has a podcast of something similar using the mia_portal_light shader....in mental ray...and it is very easy.....
1. given an enclosed room with a window, place an area light covering your window.
1a. you can also setup an Environment >Physical Sun and Sky to light the exterior.
2. access the attribute editor for the area light and open the mental ray tab.
3. enable Use Light Shape and make sure Visible is on.
4. go down to Custom Shaders and click on the Light Shader map button on the far right.
5. select the Mia_portal_light on the mental ray tab>MentalRay Lights.
6. add the same shader created above to the Photon Emitter slot.
7. in the attribute editor for the portal light shader increase Intensity Multiplier to 100 or so.

it will get you moving in the right direction....you did say you were new to mr didn't you?

Do you know how to hook up geometry to the area light after setting the Light Shape to "User"?

I tried the nurbsSurfaceShape.message to areaLight1.object .... doesn't seem to work.

Any help is much appreciated.

Thanks.

[dangerweenie]

autodesk has a podcast of something similar using the mia_portal_light shader....in mental ray...and it is very easy.....
1. given an enclosed room with a window, place an area light covering your window.
1a. you can also setup an Environment >Physical Sun and Sky to light the exterior.
2. access the attribute editor for the area light and open the mental ray tab.
3. enable Use Light Shape and make sure Visible is on.
4. go down to Custom Shaders and click on the Light Shader map button on the far right.
5. select the Mia_portal_light on the mental ray tab>MentalRay Lights.
6. add the same shader created above to the Photon Emitter slot.
7. in the attribute editor for the portal light shader increase Intensity Multiplier to 100 or so.

it will get you moving in the right direction....you did say you were new to mr didn't you?

Do you know how to hook up geometry to the area light after setting the Light Shape to "User"?

I tried the nurbsSurfaceShape.message to areaLight1.object .... doesn't seem to work.

Any help is much appreciated.

Thanks.