JarCastingmat4-interpolate
Interpolates between two 4x4 matrices, using algorithms from W3C Spec to produce consistent results with CSS animations. Like mat4-interpolator but does the decomposition in place.
Translation, scale, skew and perspective are interpolated linearly, and rotation is interpolated with spherical interpolation.
var mat4 = require('gl-mat4')
var start = mat4.create()
var end = mat4.fromRotationTranslation([], [0,1,0,0], [20, 50, -10])
var out = mat4.create()
//the matrix interpolator
var interpolate = require('mat4-interpolate')
//.. in your render loop
function render() {
//interpolate based on alpha, storing results in 'out' matrix
var vlid = interpolate(out, start, end, alpha)
if (!valid) {
//could not interpolate, you need to animate yourself somehow
}
}
Usage
valid = interpolate(out, start, end, alpha)
Interpolates between start and end matrices (16 floats in an array) and stores the result in out, using alpha for interpolation. This will decompose the two matrices into components, lerp/slerp, and then recompose.
Returns true is the interpolation succeeded, or false if either matrix is non-invertible (i.e. scale or perspective W of zero). W3C suggests falling back to discrete animations in this case.
License
MIT, see LICENSE.md for details.