photons slower than irr map??

[stephan_MA]

just did some tests to get into photon mapping.

what i did was to set up a really simple interior scene. all objects have vray materials. the scene has a direct light ( sun ) and env. light blueish multiplier 1.0.

with irr map setting high the rendering takes 44 seconds.

then i switched the second bounces to photon maps with standart values.

the rendering takes much longer..

i played around with the settings, but the photon mapping always took longer..

what is wrong??

http://www.pixum.de/viewalbum/?id=892835

regards
s.wolf

[stephan_MA]

tried it with the cornell scene.

saves me 6 seconds..

http://www.pixum.de/viewalbum/?id=892835

regards
s.wolf

[Da_elf]

well. the photon tutorial scene should have been atleast half the render time of your irradiance mapped version so it seems a step was missed there

[stephan_MA]

ok elf!

you are right with the cornell scene..

but with medium seettings and second bounce depth of 3 photons save me 15 seconds..

but what os going on in my test scene?

regards
s.wolf

[stephan_MA]

come on! people!

is nobody trying photon mapping?

or am i the only one with these strange results?

regards
s.wolf

[metroberlin]

photons are much faster than normal irradiance map. i don´t know if a small scene like the cornell box would show that. in a bigger scenee where you have to put a lot of lightning in to get it bright, photons are great. but you have to handle them with care. sometimes they create white spots, then you have to tweak the settings. normal irradiance calculation is easy to handle but with photons you can save a lot of time in large scenes with "large" rooms which are heavy to "light up".

o hdear...my english is terrible today.....it´s the heat outside

[stephan_MA]

@metroberlin: did you check my samples?

regards
s.wolf

[GoncaloP]

Hi Stephan can you send me your scene?

Gonçalo

[Da_elf]

the photon master

[GoncaloP]

Lol

here is a comparation

Irradiance map



Photon map


Gonçalo

[LuKa]

Wow, very nice. Can you please share those 2 scenes (irr. map/ with photons). Please....

[GoncaloP]

Hi Luka,

I ve sent the scene to Stephan, if he dont mind he probably can post the examples here.

Gonçalo

[stephan_MA]

and if goncalo does´nt mind i can forward his scene .


regards
s.wolf

[Psy]

if goncalop approves as well i would be most interested in seeing the scenes.

[tanveer]

me also