Beginner's question about Global Illumination

[agrmrs]

hi friends, i'm following softimage mental ray intro tute by i3d tutorials ...... today i followed a tute about GI intro and another tute regarding using GI to light up a scene ...... this scene got 3 spot lights with area shadows ....i turned on GI in lights as well as in render region > all options.... also turned on the rebuild photon map option too ........but when i render it , it doesen't seem to be GI there ..... also in that tutor's video i could see the blotchy effect there clearly ( since no tweaking hasn't been done to GI yet )....this should work since i'm following the exact method & steps the tutor does .....have i done some thing wrong ? thanx

[Zafar Iqbal]

I'm not fully routined with GI, but heres what I would looked at:

Try increasing the GI intensity to something redicolous, and see if that does anything. Coudl be it's too low (that part I still dont understand - GI intensity vs light intensity).
Make sure the GI lights are spotlights.
Make sure the GI lights are positioned close to where the GI should take effect - for instance, place them just outside the windows - not miles away.

[agrmrs]

thanx iqbal i tried it but nothing happened

i put a basic material to all the objects in the scence [ sofa,walls etc ] then i took a render .....surprised it worked very well !


.....but i have no clue why it isn't happening with textures ...... but again when the scene opens it gives me a messege like below...i think some textures are missing or replaced

thanx

[Hirazi Blue]

If you open up the "Scene_Apartment__Appartement_GI_Finished" scene, you'll see they end up with "slightly" higher values for "Global Illumination - Energy - Intensity" (25000), "Number of emitted photons" (2000000) and the "soft_light" - Intensity (1500) and that's only for one of the three spotlights present in the scene... (and these settings are repeated for all three of them)

The orange coloured warning does not seem to be something to worry about...

[agrmrs]

ohh yeah i see......but i'm done up to the beginning of 3rd video.... when they turned on the GI me also turned it on ....but only in mine it didn't work .... that's the problme ......on the other hand it worked only one time today ......but when i clicked rebuild it dissapeared ........ i closed xsi and again i tried by turning on the GI but didn't work ...... this is like a magic ....... i'll try it further more and tell u .....if u have any clue plezz leave it here .......thanx