55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
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var THREEx = THREEx || {};
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THREEx.GeometryWobble = {};
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// Geometry Wobble
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// based on paul lewis / areotwist - http://lab.aerotwist.com/webgl/undulating-monkey/
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THREEx.GeometryWobble.init = function(geometry)
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{
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for(var i = 0; i < geometry.vertices.length; i++){
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var vertex = geometry.vertices[i];
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vertex.originalPosition = vertex.position.clone();
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vertex.dirVector = vertex.position.clone().normalize();
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}
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geometry.dynamic = true;
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this.cpuAxis(geometry, 'y')
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}
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THREEx.GeometryWobble.cpuAxis = function(geometry, type, factor)
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{
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if( type === undefined ) type = 'x';
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if( factor === undefined ) factor = 0.2;
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for(var i = 0; i < geometry.vertices.length; i++) {
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var vertex = geometry.vertices[i];
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// Note: may need more axis ?
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if( type === 'x' ) vertex.axisValue = vertex.originalPosition.x * factor;
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else if( type === 'y' ) vertex.axisValue = vertex.originalPosition.y * factor;
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else if( type === 'z' ) vertex.axisValue = vertex.originalPosition.z * factor;
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else console.assert(false);
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}
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}
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THREEx.GeometryWobble.Animate = function(geometry, phase, magnitude)
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{
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if( phase === undefined ) phase = 0;
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if( magnitude === undefined ) magnitude = 0.2;
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if( typeof magnitude === "number" ) magnitude = new THREE.Vector3(magnitude, magnitude, magnitude)
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for(var i = 0; i < geometry.vertices.length; i++) {
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var vertex = geometry.vertices[i];
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var vertexPhase = Math.cos(phase + vertex.axisValue);
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vertex.position.x = vertex.originalPosition.x + vertexPhase * vertex.dirVector.x * magnitude.x;
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vertex.position.y = vertex.originalPosition.y + vertexPhase * vertex.dirVector.y * magnitude.y;
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vertex.position.z = vertex.originalPosition.z + vertexPhase * vertex.dirVector.z * magnitude.z;
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}
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geometry.__dirtyVertices = true;
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}
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