GI settings for interior animation

[kpavlov]

I have to make 5 min animation of interior. This is familly house with no furniture, just walls, doors...
I usually do this type of project in Lightscape but this client gave me finished 3d model and I cant use Lightscape becouse of bad modelling.
I am new user of vray so could somebody post here some good settings for interior rendering.
I know I have to render every 10-20 frame for GI solution but do I have to use direct computation or photons for secondary bounces. Please some good settings for photons and irradiance maps. Thanks.

[tom schuelke]

Hallo Kpavlov

well you are new to vray.

Usualy i would do intereiors with photonmapping for the secoundary bounce and i-map for first bounce.

vray uses a overal other way to compute light, compared with lightscape. While lightscape calculates from the light bouncing through the scene, vray calculates the light, serarching light beginning with the camera, when it only uses i-map.

for this it only calculates some of the points in the sceene, tracing from this point dozens of "searchray" into the scene, for looking how much light reaches those points. Inbetween theese points, it interpolates lightsolutions.

Well, the problem now is, in intereiors, when you have only smal areas lightened by the sun, ore lamps, each samplepoint have to trace much more rays than in an exterior sceene, to view those smal lightareas, to get a statistical good lightning, that doesent flicker for animations.

for this reason for interiors you should use by now photonmapping, which produces a rather rough lightsolution at each point in the scene, sending out light photons from each light, you use. But ! this isn´t very easy to setup.

Vlado one of the programmers some time ago has posted a link to a small tutorial to get in this. It´s a must read tutorial if you want to have fast calculations for interiors. In future by the way there will be another much better solution for this called lightmap that will come to us with vray 1.5.

So you should use Photonmapping for secoundary bounces, which means, you can only use vray materials and photonmapping only with Vraylights.

for first bounce use i-map, with high settings, which is easy for you to setup.

in the advanced i-map settings, you have to switch to: incremental ad to current map. Also use save imap to .... and switch to i-map after rendering.

in the global rendering settings turn on, don´t render final image, and also turn on render every tenth frame. (if your camera moves faster, maybe shorter about 5 frames, if you move slowlyer, use higher settings maybe 15 ore 20 frames).

now render your scene (but dont forget to use visual frame buffer, and switch on preview of imap calculation).

after prerendering your scene, you should have a scene, switched to the i-map.

turn of "don´t render final image", and turn on render n´th frame , "1".

that´s it.

for interiors this is a greate aproach also compared to lightscape.

hope this helps.

mayby natty ore some of the others knows a link to the photonmapping tutorial


greetings from Hamburg


www.lichtecht.de

[Moose]

heres the link to the photon map tutorial;
http://www.vrayrender.com/stuff/PMapTutorial/

[Syclone1]

Goncalo has a good writeup on it in the forum and I think Natty posed a sample scene using photon in the secondary. I don't have the links so you will have to use the forum search. Sorry to make you work for it a little

-dave

[natty]

here's a simple tutorial i did a while back

http://www.chaoticdimension.com/foru...pic.php?t=5360

[kpavlov]

Thanks guys I'll spent some times experimenting these tutorials.