View Full Version : Is it possible to change a mesh at render time.
03 March 2006, 11:08 PM
I've been going over the #preRenderFrame callbacks and it explicitly says you cannot change a mesh during render time, due to it caching the mesh beforehand. Is there actually a way around this, short of scripting it to render sequentially one frame at a time?
03 March 2006, 09:27 AM
What exactly are you trying to change? it is possible but you need to remember that changes you do for one frame are going to be there for the next! I was experimenting with this the other day and found a few hurdles to get over.
Firstly, can you do the first frame with #prerendereval and then all subsequent frames with #postrenderframe ?
03 March 2006, 10:26 PM
I'm pretty much changing the mesh every frame. What I've made is a timer object that changes the text object (which is shelled) as it counts down, like so:
The problem is, you can't use prerender or postrender in this sitatuion, because it takes a pointer the initial mesh (in this case the text with 6:00).
At this stage I've had to write my own frame-range script to actually render each frame seperately and incrementally, which works fine. I had to throw a gc() in per frame though, because the memory was skyrocketing!!!
03 March 2006, 11:54 PM
Yep, that's what I've had to do in this type of situation also. Here's the script I use, nothing amazing but it gets the job done:
fn zeroPad num = (
local n = num as string
if num >= 0 and num < 10 then ("000" + n)
else if num > 9 and num < 100 then ("00" + n)
else if num > 99 and num < 1000 then ("0" + n)
if rendOutputFilename == "" then messagebox "Enter a file name in the Render Output section of the Render dialog box."
totalFrames = ((animationRange.end - animationRange.start) as integer) * framerate / 4800
escapeEnable = true
for i = animationRange.start to animationRange.end do (
sliderTime = i
n = zeroPad (i as integer / 160)
render vfb:false outputFile:((getFilenamePath rendOutputFilename) + (getFilenameFile rendOutputFilename) + n + (getFilenameType rendOutputFilename))
progressUpdate (100.0 * i / totalFrames )
if getProgressCancel() do exit
03 March 2006, 01:44 PM
I usually put a script controller on the text kerning parameter (under a list controll so I can still modify the kerning if I want!) That way the text is calculated every frame.
03 March 2006, 01:44 PM
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