Incremental add to current map- size issuse

[Da_elf]

multiframe incremental is good for anim but not good for saved maps. basically as the animation is going when a new object comes into the scene new samples are calculated for them but the objects already calculated for in the shot will keep its samples meaning not as many NEW samples need to be calculated each frame. however when an object passes out of the shot its samples are dumped. meaning less ram usage. The problem however is that if you save the solution all those dumped samples are gone so its not saved.
incremental add to current means kind of the same thing. as new things come into the shot new samples are taken exactly like the other method. however when the objects pass out of the shot the samples are kept. ram usage is alot more but when you save the map it will contain all the samples needed to rerender with.

note: neither are good for any animation with moving objects other than the camera.

[Olli96]

aye, thanks for clearing that up to me

[gilpo]

Elf, just to clarify a little for me:

Based on your description, why would you ever use multiframe incremental? The whole purpose of pre-calculating an irmap is to save it to render an animation. How could you ever pre-calc an irmap with multiframe incremental since the samples are dropped for objects that have passed? Am I missing something or do I just not get it? I've been using a pre-calc'ed IM with multi-frame incremental every 30 frames and have had no problems so far.

[natty]

Multiframe incremental - this mode is useful when rendering a sequence of frames (not necessarily consequtive) where only the camera moves around (so-called fly-through animations). VRay will compute a new full-image irradiance map for the first rendered frame; for all other frames VRay will try to reuse and refine the irradiance map that has been computed so far. If the irradiance map is of sufficiently high quality as to avoid flickering, this mode can also be used in network rendering - each rendering server will compute and refine its own local irradiance map.


Add to current map - in this mode VRay will compute a completely new irradiance map and will add it to the map that is already in memory. This mode is useful when compiling an irradiance map to render multiple views of a static scene.



Incremental add to current map - in this mode VRay will use the irradiance map that is already in memory and will only refine it in places that don't have enough detail. This mode is useful when compiling an irradiance map to render multiple views of a static scene or a fly-through animation.

[Da_elf]

strange. thats the description that used to be in the manual. seems changed now. ah well. incremental add to current is usually the main one needed

[Da_elf]

ok ok ok. went and re-read and came up with this quote

Q: Why did you choose Multiframe incremental over Incremental add to current map mode? What is the difference between the two that would cause you to choose one over the other? I ask because Ive never used Multiframe incremental and have always used the Incremental add to current map.

A: The only difference is that the Multiframe incremental mode will delete the map in memory at the start of the rendering. With the Incremental add mode, the current map is not deleted.

[glyph]

da elf: you do know its only deleting anything at the start of rendering?
- ie start with a clean sheet - it doesn't dump what's out of frame

[Da_elf]

yeah thats what its saying. deleting at the start to have a clear buffer.

[dansimon]

back to my problem... De_elf, ive tryed to prerender my irradiance map with nth frame on 5.

this is what i get....


Same problem like i thought would happen, runs out of memory.

Is my best bet to just render single frame irradiance. Its the incremental add Irr that is chewing throuhg my memory.

single frame?

[RErender]

Render single frame imapss at nth and merge them with imapviewer.

[Da_elf]

maybe you can do it in stages. especially if you have a network. set 1 computer to do 50 frames. then the next computer to do the next 50 frames etc etc. then join them. make sure they save as different named irradiance maps. Room1.imap, Room2.imap etc

[dansimon]

good info. thats what il do. will give it a try over the week end.

untill monday...

thanks

[serge]

maybe you can do it in stages. especially if you have a network. set 1 computer to do 50 frames. then the next computer to do the next 50 frames etc etc. then join them. make sure they save as different named irradiance maps. Room1.imap, Room2.imap etc

you can send the whole animation to your network
it doesen't matter in which order irmap are calculated
(no need to send frames 1-50 to server 1 _51-100 to server 2 etc..)
just submit your job to your renderfram
be shure that you save your incemental irmap on the local drive of your servers
when calculation ends take all irmap of your servers one by one (they have all the same name doesen't matter)
join them wit imap viewer