animation prepass problem

[tashko.zashev]

1) After i install Embree to all the render nodes, do i still need to install Embree on my local pc?

All machines participating in the render should have the plugin. Also make sure that all processors have support for SSE4.2

A) set IR to primary, uncheck "Use Camera Path", HSpd:50, Interp.sample:14,Mode: Animation Prepass
B) set LC to secondary, check "Use Camera Path", Subdiv: what i want, Sample size:0.02, Scale:screen, Mode: Single frame.
C) leave everything as default ( or do i need to set DMC sampler, noise threshold and etc?), click render.

This could be the precalculation setup and

( or do i need to set DMC sampler, noise threshold and etc?)

Yes, you will need to set them at this stage: noise threshold; Ad. amount; Global subdiv;
The Irradiance map (subdivisions) will be affected by any changes in those parameters.

[jackieteh]

All machines participating in the render should have the plugin. Also make sure that all processors have support for SSE4.2




This could be the precalculation setup and


Yes, you will need to set them at this stage: noise threshold; Ad. amount; Global subdiv;
The Irradiance map (subdivisions) will be affected by any changes in those parameters.

Thank you very much for your clear explaination. i will give it a try and let you know the result.

Regards,
Jackie

[jackieteh]

hi tashko.zashev, actually i follow this tutorial: http://help.chaosgroup.com/vray/help...ials_anim2.htm to set up my animation, in this tutorials it has a image show up that when calculate IR map using animation prepass, we need to check the "Use Camera Path", please check it out, thank you very much.

Regards,
Jackie

[tashko.zashev]

Generally you could leave the "use camera path" option checked when calculating the Irradiance map, but keep in mind that the samples (HSPh subd.) will be distributed for the entire camera path and not for the current view (frame) only. This way you may need to increase the Irr map subdivisions a lot for some cases in order to get quality GI solution, otherwise it will be quite blurry. Also the render time will go up.

So I assume that for this specific scene you will be able to get flicker free animation result in less time without using it. However, you could always run a test render just with few frames to see the final animation result.

As you know the best approach is to use Brute force / Brute force GI, but it requires a lot of CPU power. Therefore we have additional engines, options, features, which could be used to speed up the GI calculations. Everything depends on the scene and the requested result. You don't need to add 200 subdivisions for Irr map if the scene renders in good quality using just 50 for an example.

[jackieteh]

Hi Tashko Zashev,

Thank you very much for your clear and detail explanation.

Regards,
Jackie

[ben_hamburg]

I see that "Use camera path" option for the Irradiance map engine is enabled, which is not recommended when you are using Animation prepass/rendering mode.

I just stumbled upon this and it looks like I finally know what I did wrong following all those tutorials, that told me to "use camera path"...

Can´t wait for the enxt project where I need GI to test this out...