CGTalk Can MEL be used to perform math equations
 10-18-2010, 08:02 PM #1 thegarland New Member portfolio Christopher Garland Modeler Merlil Productions Niagara Falls, USA   Join Date: Mar 2010 Posts: 12 Can MEL be used to perform math equations Hey guys, I have a new to perform certain equations numerous times. They're relatively simple equations, but it's a little tedious to work them out on paper over and over. So I'm trying to see if I can write a MEL script that will calculate the equation for me when I plug in certain variables. Kind of like a java applet. But I don't know anything about java programming, so I'm wondering if I can do it in MEL. These are the two equations: T = 2 * sqrt[ D/A ] where I get the value of T once I define D and A T = ((D - (A * t^2)) / (A * t)) + (2*t) where I get the value of T once I define D, A, and t Thanks. share quote
 10-18-2010, 09:04 PM #2 mduvekot Lord of the posts   Michiel Duvekot Owner THNKR Toronto, Canada   Join Date: Dec 2003 Posts: 1,063 sure.. first you'd declare a procedure, like this: proc float myProc (float \$D, float \$A) { if (\$A == 0) { error "Cannot divide by zero\n";} return 2 * sqrt(\$D/\$A); } If you save the procedure to one of the directories in the MAYA_SCRIPT_PATH, under the same name as the procedure, you can use it without having to declare it first, as Maya does it for you. In this example, I would save the code to myProc.mel in one of the script folders that I can find with getenv MAYA_SCRIPT_PATH; and then you can run your code: myProc 2 3; // Result: 1.632993 // __________________ Michiel http://thnkr.com share quote
 10-18-2010, 09:07 PM #3 NaughtyNathan HighEnd3D deserter   Naughty Nathan Technical Artist Sony SCEE Liverpool Manchester, United Kingdom   Join Date: May 2008 Posts: 2,608 of course you can do this kind of thing, it's practically the base functionality of all programming/scripting languages! it's also very easy, if fact it's almost exactly the same in python as you've written it out: Code: ```# python from math import sqrt D = 0.5 A = 3.14 T = 2 * sqrt( D/A )``` and here's how it would look in MEL seeing as how that's what you asked for: Code: ```// MEL: float \$D = 0.5; float \$A = 3.14; float \$T = 2 * sqrt(\$D/\$A);``` :nathaN share quote
 10-18-2010, 10:15 PM #4 thegarland New Member portfolio Christopher Garland Modeler Merlil Productions Niagara Falls, USA   Join Date: Mar 2010 Posts: 12 Thanks a lot, guys! Both methods worked great. share quote
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