Irradiance Map in animation

[FlytE]

I have 2 quick questions.

 

First I noticed in an animation i did recently, that i got some magic white spots on some of my surfaces, mainly on the glass... but when I render out stills of the same view as single renders the dots do not appear. Why does the irradiance map appear different in an animation and how do I fix it?

 

Second question is about irradiance maps in general. For the above mentioned project it was actually several animations combined, for which i rendered out the irradiance maps seperatly. I then combined them all to make 1 super irradiance map. My question was, is this a mistake? By using a large and extensive irradiance map does it actually start to slow your rendering times back down again? Would I have been better to just start a fresh new smaller irradiance map?

 

On this particular project, there was a tight deadline.... and there will be another soon, so Im looking to find every way possible to reduce the times involved in rendering out an animation etc. If there are any other techniques or suggestions which anyone can share, I would love to know!

[manta]

Are you doing this...

 

http://www.spot3d.com/vray/help/VRayHelp150beta/tutorials_imap2.htm

[FlytE]

Im partly doing that. Im not using light cache but I am saving my irradiance map. That tutorial doesnt really answer my questions but i am starting from scratch with my scene to try and optimise it. I will probably try to use light cache in the same way...

[Christopher Nichols]

I have 2 quick questions.

 

First I noticed in an animation i did recently, that i got some magic white spots on some of my surfaces, mainly on the glass... but when I render out stills of the same view as single renders the dots do not appear. Why does the irradiance map appear different in an animation and how do I fix it?

 

Second question is about irradiance maps in general. For the above mentioned project it was actually several animations combined, for which i rendered out the irradiance maps seperatly. I then combined them all to make 1 super irradiance map. My question was, is this a mistake? By using a large and extensive irradiance map does it actually start to slow your rendering times back down again? Would I have been better to just start a fresh new smaller irradiance map?

 

On this particular project, there was a tight deadline.... and there will be another soon, so Im looking to find every way possible to reduce the times involved in rendering out an animation etc. If there are any other techniques or suggestions which anyone can share, I would love to know!

 

I cover this subject pretty well (I think) on my exteriors DVD. As far as "too big" what is the size of your IR map? Try to keep it under 200 megs at the very most. 50 megs is generally more than enough.

 

White dots... are you sure nothing is moving in your scene? If not... you may need more detail IRmap in that area. Do some spot renders of them, and add them to your current map.

[FlytE]

Yes I pretty much followed the way you describe on your dvd when i originally tried this but i had all sorts of problems. In hindsight I think this was down to various things but most significantly, due to an unoptimised model.

 

I have manage to get rid of the white spots - medium quality animation in the irradiance map settings seem to solve that. I seem to have developed another problem though in the form of an irradiance map that doesnt want to render and in fact crashes viz. This is after a series of successful tests which makes it all the more confusing.