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Applying 4x4 Matrix to Vector
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| function( | |
| a, //4x4 matrix [array] | |
| //[a, b, c, d, | |
| // e, f, g, h, | |
| // i, j, k, l, | |
| // m, n, o, p] | |
| b,c,d //vector (x, y, z) | |
| ){ | |
| for( //loop through matrix | |
| var f=e=[];f<16;) // [] coerces to 0 as number | |
| e[f/4] = //add to list | array indices are coerced to integer values | |
| a[f++]*b+ //calculate | |
| a[f++]*c+ //calculate | |
| a[f++]*d+ //calculate | |
| a[f++] //calculate | |
| ; | |
| return e //returned result: [x,y,z,1] | |
| } |
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| function(a,b,c,d){for(var f=e=[];f<16;)e[f/4]=a[f++]*b+a[f++]*c+a[f++]*d+a[f++];return e} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 srifqi srifqi.github.io | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "applyMatrix4ToVector", | |
| "description": "Applying 4x4 Matrix to Vector.", | |
| "keywords": [ | |
| "apply", | |
| "square", | |
| "matrix", | |
| "to", | |
| "vector" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>0, 0, 0, 1</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| // write a small example that shows off the API for your example | |
| // and tests it in one fell swoop. | |
| var myFunction = function(a,b,c,d){for(var f=e=[];f<16;)e[f/4]=a[f++]*b+a[f++]*c+a[f++]*d+a[f++];return e} | |
| document.getElementById( "ret" ).innerHTML = myFunction([1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],0,0,0) | |
| </script> |
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[] coerces to 0 as number; array indices are coerced to integer values (save 3 bytes):