I have 2 mesh objects. Anchor and Rod. The Anchor rotates around z-axis, as illustrated by the image. The rod is supposed to move only backward and forwards. Here is the image: http://imageshack.us/photo/my-images/841/7a83.png/.
But i am stuck with trying to figure out the matrix calculation. For example if the anchor rotates 45degrees, so its facing the x-axis, how can i make the rod still move backwards and forwards?
For the rotation around z axis :
var rotation = new THREE.Matrix4().makeRotationZ(Math.PI/2);
For the translation, where z is your delta :
var translation = new THREE.Matrix4().makeTranslation(0, 0, z);
You can combine the two transformations in beginning with the translation :
var transformation = new THREE.Matrix4().makeTranslation(0, 0, z).makeRotationZ(Math.PI/2);
var transformation = rotation.multiply(translation);
Then apply transformation to your geometry :
geometry.applyMatrix(transformation);
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