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About Em_Fn

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  1. Thank you so much ! That solved my problem , caching the position every 10 substeps I had to also add || @Frame == ch("../../../startframe") in order to get the position before the start frame, as I was using the intersect function and it was firing the ray from the origin to my starting positions.
  2. I just compared my file and yours, I realised the problem is the substeps, I used a substep of 10 in your file and the same issue happened, how could I fix this problem?
  3. I am currently using a sop solver to update the position the position of some points based on the current position. I need to save the current position as a new attribute to calculate the distance between the new position and the current position. My approach was to save the attribute out before I do the calculation, so that each position will be saved as an attribute before the calculation. However, the doesn't seem to work I did : v@prevPos=@P; my calculation which is v@P+=@V*timestep; v@nextPos=@P; as you can see, the @prevPos in frame 2 should equal to @P in frame 1, but it doesn't?
  4. This is my first time rendering in Houdini (Mantra), I have been trying to learn how to optimise my renders. I have looked at the documentation and it recommends adding direct and indirect samples image planes. I am not sure what to do with the information provided by them. What do these numbers refer to and how can I use this information to reduce noise?
  5. I am quite new to Houdini, I came across this video and is so impressed by this video. I have looked at some folding techniques like the ones on cgwiki etc, but I think this one uses a different technique? I am not too sure how to achieve these effects, , the video is quite low res so I think some of the nodes used I don't even know about. Would anyone be able to help me with the workflow, it's seems like he animated the line with points and do some sort of extrusion ? I have seen videos that use polygon but this one seems to be doing something else. and will the UVs be maintained? ,