rob Posted March 26, 2008 Share Posted March 26, 2008 (edited) I have this expression running in a point SOP $TZ + snoise($TX*0.3+$T*0.5,$TY*0.3,$TZ*0.3) *(0.5-$BBY) it works great but my animation finishes at frame 240 but theres more frames to go before the sequence ends. It must be possible to tell this expression to run between frame xx and finish at frame xxx , I was thinking along the lines of using greater than or equal to maybe ? to control when the expression runs or not as the case may be. Any chance of a prod in the right direction with the syntax R Edited March 26, 2008 by rob Quote Link to comment Share on other sites More sharing options...
rdg Posted March 26, 2008 Share Posted March 26, 2008 I have this expression running in a point SOP $TZ + snoise($TX*0.3+$T*0.5,$TY*0.3,$TZ*0.3) *(0.5-$BBY) it works great but my animation finishes at frame 240 but theres more frames to go before the sequence ends. It must be possible to tell this expression to run between frame xx and finish at frame xxx , I was thinking along the lines of using greater than or equal to maybe ? to control when the expression runs or not as the case may be. Any chance of a prod in the right direction with the syntax R if($F < 240, $TZ + snoise($TX*0.3+$T*0.5,$TY*0.3,$TZ*0.3) *(0.5-$BBY), [what ever]) I don't think $T is such a good option, even my $F isn't the true thing if you need motion blur. At least inside your expresssion, I guess the $F in the if might be just fine. Georg Quote Link to comment Share on other sites More sharing options...
sibarrick Posted March 26, 2008 Share Posted March 26, 2008 Why not just key frame it and put the expression only in the segment where you want it. Quote Link to comment Share on other sites More sharing options...
Netvudu Posted March 26, 2008 Share Posted March 26, 2008 oh! can you keyframe and input an expression at some segment? what Quote Link to comment Share on other sites More sharing options...
rdg Posted March 26, 2008 Share Posted March 26, 2008 oh! can you keyframe and input an expression at some segment? what Quote Link to comment Share on other sites More sharing options...
sibarrick Posted March 26, 2008 Share Posted March 26, 2008 (edited) Just add two key frames and then go to a frame that is in between the two and enter your expression. When you go to a frame before or after your keys you will see the expression is gone and normal animation resumes... Edited March 26, 2008 by sibarrick Quote Link to comment Share on other sites More sharing options...
rob Posted March 26, 2008 Author Share Posted March 26, 2008 (edited) Notes another BIG tick for using houdini , is there any way to control the interpolation between the 2 , so I could have some sort of fall off Edited March 26, 2008 by rob Quote Link to comment Share on other sites More sharing options...
rob Posted March 27, 2008 Author Share Posted March 27, 2008 (edited) Thought this might help someone. I have been fiddling around trying to blend between a noise expression in a point SOP to have it start and stop on a frame number of my choosing. To get the noise to fall off in a particular direction , just move the +FF*01 between the $TX and $TZ point positions R Noise_displace_02.hipnc Edited March 27, 2008 by rob Quote Link to comment Share on other sites More sharing options...
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