Calculation of the Irr Map!!!

[Black_Phoenix]

Hi guys!!!

I wrote yesterday a topic about calculating an irr map. It´s very important for me to use these technic methode.

From the beginning:

I have a fly through ani. In these animation some objects are fade out and after few frames the objects fade in. If i calculate the irr with "incremental add to current map" it works kick-ass, when the objects will not be fade in or fade out. If i calculate the irr and objects were fade in or fade out, i will have shadows while the object is fade out. These is wrong. There is no diffenrent between a rendering by every frame or a rendering by every 10th frame for the irr map.

In these case ( fly through ani with fade in and fade out from objects) can i use a precalculate irr map, or is these methode wrong and i must use " Singel frame" and calculate the irr map for every Frame without saving in front??

THX guys

Max

[Sushidelic]

hi Max,

in some way, you already answered the question yourself
If you have a saved map, it is quite obvious, that it cannot change over time. using a saved map means applying ONE static map over your whole image, giving those artifacts when rendering moving geometry. you'll have to use single frame calculation, direct computation, or render all non moving geometry with a saved map and add another renderlayer with the moving objects for compositing. there were some threads about this on the forum, you could do a search for "compositing" or "layers"...

regards, michael

[DanielBrew]

Hi Max

I think I understand the problem you are having. We had to do an animation with objects fading in and out about a year ago. We came to the same conclusion as you - that you can't use either a saved IR map or incremental add. We also found that the rendertimes for the frames where the object is fading were 10 - 20 x longer than the others.

Our solution was to render the animation with the objects present and then rendered again with the objects completely absent (you can use incremental add for these). Then 'cross faded' between the two animations in Premiere. So the objects, their shadows and any colour bleeding fade in and out smoothly.

Hope some of that helps with your animation,

Dan