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Hi! first of all, sorry if ive posted in the wrong section, but i wasnt sure if this was a bug or user error! http://www.babylonjs-playground.com/#825NJL#1 here is a playground of what im trying to do for work, please excuse the eye as i am unable to use the actual texture. its basically a wake for a boat. in the above playground the wake grows in the y axis. but I additionally need it to grow in the x axis but the buttom two verts at a faster rate than the top two. I created a updateParticleVertex function which worked perfectly using Babylon version 3.0 unfortunately I had to update to 3.1.1 (and have also tried 3.2.0-alpha2) which now when i uncomment line 48 - localScene.SPS.computeParticleVertex = true; - it throws the following error - SCRIPT5007: Unable to get property 'length' of undefined or null reference. which points to a minified piece of code even though i downloaded the un minified option ( this is the line it is pointing to if this helps - babylon.custom.js (17,29530)) I am using IE11 (unfortunately) due to customer request. is this a bug or can anyone tell me where my user error is? thanks and please do ask me a question if i am being unclear in any way! Thanks again, John.