Created
September 9, 2014 15:16
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toxiclibs: Quaternion error
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| {axis: [0.0,0.7078125,0.0], w: 0.70781255} | |
| {axis: [0.0,-0.70922744,0.0], w: 0.7064004} |
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| import toxi.geom.*; | |
| /* | |
| Two quaternions with same angle and same axis don't match. | |
| One is created from axis and angle. | |
| Another is created from matrix. | |
| */ | |
| void setup() { | |
| noLoop(); | |
| Quaternion q1 = Quaternion.createFromAxisAngle(Vec3D.Y_AXIS, HALF_PI); | |
| Matrix4x4 m = q1.toMatrix4x4(); | |
| Quaternion q2 = Quaternion.createFromMatrix(m); | |
| println(q1); | |
| println(q2); | |
| } |
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Hey, this commit fixes this issue:
https://bitbucket.org/postspectacular/toxiclibs/commits/b247b2067b218b775958523eab411dc4c8699a1e
More generally, you'll not always get the exact same quat back from such a round trip due to gimbal lock and other possible singularities, but the final quat will produce equivalent results when applied to a 3D vector (see test include in above commit). More info here