A quick guide on Irradiance Cache Settings in Cinema 4D

January 10, 2010


In response to a video tutorial by Ross Gerbasi.

With help from Rob Redman of PariahStudios.

25 Comments

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  1. illd on January 11, 2010 said...

    Gentleman,
    that was really enlightening. On of the big C4D mysteries is solved. This interactive Tutorial thing is really great – I often was thinking about a problem in the work-flow, and bamm! Nick was asking it – scary! What I would like to know is the thing with netRender and IR Files. Woukd it be better to be pre-rendered on one machine (like Nick suggested over night) or at the final render with all clients at once?

    prayas

    The IR like any prepass has to be done on one maschine as far as i know. It’s the same with cached data for almost any module ( dynamics for example ) and also with cached data from plugins.

    P..:

  2. Leo on January 11, 2010 said...

    Thanx man!

  3. dogimo on January 11, 2010 said...

    thx to both of you.

  4. Joe on January 11, 2010 said...

    When I saw the thumbnail of this video, I thought Nick shaved his head hahahaha!

    Carl

    I thought the exact same thing!

  5. prayas on January 11, 2010 said...

    Thanks Nick and Rob for the insight. I did know some of this from the vray trial and error period. But all this helps.
    If you are still on R11 there is a small plugin named SmartSave that saves every render from the Live view to a file. Not updated to 11.5 so far it’s a pretty brilliant workflow tool. Can save jpeg and tiff.

    http://www.smart-page.net/smartsave/

    P..:

  6. Deelan on January 11, 2010 said...

    Hi Nick,

    As always You and Rob are the C4D champions.
    I’m new to this whole 3d concept thing, but learning in baby steps.

    My question is can you use this option if you don’t have GI and your using standard lights to map the scene?

    I’m doing one with extruded text, x3 lights for front/side and back and a slow CU of the camera moving around the object.

    thanks in advance

    Deelan

    illd

    I think his will only work for GI. Simply because the switch its only available in the GI/IR tab

  7. med on January 11, 2010 said...

    here is a video rec of the problem i have with the rotate tool,hope someone can help me, thanks

    http://vimeo.com/8665761

    eli

    That’s really strange. You could try messing around with the x, y, z buttons on top. Click some of them off and see what happens.

    Sock Gardener

    Check your preferences under ‘Units’ (in R10). You’ve somehow managed to turn on ‘Use HPB System’.
    HTH

    med

    Thank you sock Gradner you’re my hero,yes it’s the Use HPB System, now my rotate toll work like a dream, Big thanks to you & eli for your help Barvooo..!

    mommy

    Barvooo Gradner!

  8. Ross on January 11, 2010 said...

    Nick & Rob,

    Thanks a lot for the reply, you guys rock! That makes a lot more sense now! :)

    We gotta get Rob out this way I owe him a dinner!

    -ross

    rob redman

    I’m hoping to get over there in the next few months, so I’ll hold you to that!

  9. Dave Glanz on January 11, 2010 said...

    Ross’s video helped me a lot for a project I’m currently working on for Travel Channel here in DC. I had to build a football stadium for a promo, and (not having a render farm here yet) I had to render the GI pass on a slower computer, and the final pass on a much faster one.

    Really looking forward to the lighting rigs!

  10. TJ on January 11, 2010 said...

    It is great to see these types of discussions as we are all going from beginners to, well, better beginners in our work. I am guilty of turning on GI and hoping for the best. Now I know a lot more about what the setting are for. Thanks and I can’t wait to learn more.

  11. Kai Pedersen on January 11, 2010 said...

    Just some correction/clarification notes:

    that special pass is actually a error/fault check pass, so basically it is checking for any drastic/dramatic changes, if there isn’t then it will render with existing pass only, if there is it will compensate.

    If you lock then it uses only the stored cache and can produce really nasty results if you say added an object.

  12. Kai Pedersen on January 11, 2010 said...

    one thing that is missed is simple moving of objects, that won’t update the autoload.

  13. Matt on January 11, 2010 said...

    Allrighty some nifty stuff.
    To make a few things clear (for me mostly :p);
    if I were to make an animation with the auto load on, and I would make some changes in let’s say the texture pattern and it’s color the re-render would take up to 90% less time and still look correct (what about the reflection of color onto it’s enviroment, would that still be valid) ?

    And rendering it with a different anti-aliasing or greater resolution would that work ?

    Thanks for the info :)

  14. Dimitris on January 11, 2010 said...

    How can i make the shadows appear without having a light?

    eli

    You have to turn on the “shadow caster” check box. Click on your light the you want to make shadows with. Go to the details tab and that’s where you will find the shadow caster box.

  15. eli on January 12, 2010 said...

    One thing about autoload is that it can actually make things slower in certain circumstances. I made a scene with 200 bouncing, glowing orbs using using the IR setting. For whatever reason, using auto load cache dramatically slowed render times.

    I think it’s because all the primary light was coming from the glowing orbs and their reflections so the GI had to be re-cached every frame. The resulting cached file was over 100MBs. Turning off auto load made things over 400% faster.

  16. miketan on January 12, 2010 said...

    Hey Guys,

    Thanks for this tutorial.
    I’d been scratching my head with the GI cache settings.

    This is also particularly handy when using online render farms, where you have to supple a gi cache file separately to your project files.

    Also I would love to share information with folks on what things I’ve learnt or get stuck on, what’s the best software to records your screen and camera simultaneously with?

    Mike

  17. jbizzle on January 13, 2010 said...

    this great to have this broken down

    trying to get a workable recipe for GI in animations. the default is like 11 prepasses – is there any good wisdom available as to what settings we can tweak to get render times down.

    also, is shadow flicker a solved issue?

  18. Mohammad Naveed Khaw on January 13, 2010 said...

    previously i was 3ds max user, but now i am learning c4d and found it best tool for motion graphics, nick you are helping me a lot and this GI option really saves my life. thank nick.

  19. clouder on January 13, 2010 said...

    I watched one of your tutorials and found it amazing,solved some of my puzzles about C4D,thank you again

  20. TOM on January 25, 2010 said...

    Awsome and cool tutorial!!!
    I would like to ask how would someone make a image that is self illumnated! Like a bunch of balls that has glow in side them but no light or sky!? Could you help me?
    Cheers

  21. Jur on February 3, 2010 said...

    Man, the 1st thing I did was looking for the alternative + sign when stepping over from 3DsMax. Save incremental saved my life a few times :)

    Studio setup sounds pretty promising.
    Maybe you guys can figure out what the guidelines for the ‘preparing’ stage are. Still kinda black box to me. May grab my cam and post a request for it soon.

    Thnx .. keep rockin’

  22. Paul Selhi on February 6, 2010 said...

    There is possible a mistake with the concept of using cached gi and changing objects colors

    Make a cornel box setup with say a sphere inside, make the sphere red and have it on high gi generation say 500 % so you can see the red spill on the floor. Now render with save on for the gi
    If you render this using the cached gi but change the sphere color to green you will see that the gi spill is still red

    The Gorilla

    Thanks for clarifying, Paul!

  23. rich on February 10, 2010 said...

    Great tutorial guys, but still a bit confused.

    So if i’ve got lock on all i can do is change the camera position.

    If i’ve got lock off but autoload on, all i can change is the above plus, object and light colours, textures.

    If i need to adjust the position of geo, add new geo, adjust light position or intensity then i have to flush the cache or turn off auto load (which would cause the cache to be rewritten anyways).

    Is that essentially it?
    Great tho speeds things up a treat

  24. GRPstudio on March 1, 2010 said...

    Hi! first, congratulations! greyscalegorilla and pariah are great! this is my first comment in the blog :D

    I have a very big problem with the GI, and i think that i´m making something stupid wrong :( .

    when i render a animation a lot of stranger shadows appears in my scene. Do you understand me? :(

    The Gorilla

    Sounds like you may be using “Camera Animation” settings. Try using the “Full Animation” and your weird shadows should go away.

    GRPstudio

    lot of thank Mr. Gorilla! but… it will take a lot of time! isn´t it? can i make a pass only for the GI? cause, if i make a render only for GI when i try to render with the cache calculated weird shadows appears again…

    PD: excuse me for my english… i´m spanish :S

    The Gorilla

    There is no shortcut for good looking GI. You have to wait it out. Especially if objects are moving.

    GRPstudio

    and for netrendering??

  25. GRPstudio on March 4, 2010 said...

    And for netrendering?? :S

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  1. By VizWorld Pixels for 1/11/2010 | VizWorld.com on January 11, 2010 at 6:00 pm

    [...] Modcast with David Stripinis, Virtual Camera Operator for AvatarMaya into AfterEffects WorkflowIrradiance Cache Settings in Cinema4DThanks to @nicholaspatten for several of these. If you’re not following him already, then you [...]

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