Transform nodes memoise when super transform updated

Transform nodes are supposed to discard internally memoised state when any super-transform properties have been modified via setter methods.

Description

Problem found where if they start in memoLevel 1 (when statically configured) and are lucky enough to ascend to memoLevel 2, they don't reset to memoLevel 1 when a super node has had an attribute updated (eg. angle, translation, scale etc) because they don't check.

SceneJS.Scale.prototype._render = function(traversalContext, data) {
    if (this._memoLevel == 0) {
        if (!this._fixedParams) {
            this._init(this._getParams(data));
        } else {
            this._memoLevel = 1;
        }
        this._mat = SceneJS._math_scalingMat4v([this._x, this._y, this._z]);
    }
    var superXform = SceneJS._modelViewTransformModule.getTransform();
    if (this._memoLevel < 2) {
        var instancing = SceneJS._instancingModule.instancing();
        var tempMat = SceneJS._math_mulMat4(superXform.matrix, this._mat);
        this._xform = {
            localMatrix: this._mat,
            matrix: tempMat,
            fixed: superXform.fixed && this._fixedParams && !instancing
        };

        ////////////////////////
        // Calculate memo level
        ////////////////////////

        if (this._memoLevel == 1 && superXform.fixed && !instancing) {   // Bump up memoization level if model-space fixed
            this._memoLevel = 2;
        }
    }
    SceneJS._modelViewTransformModule.setTransform(this._xform);
    this._renderNodes(traversalContext, data);
    SceneJS._modelViewTransformModule.setTransform(superXform);
};

Fix

Inherit memoLevels on the matrix stack:

SceneJS.Scale.prototype._render = function(traversalContext, data) {
    if (this._memoLevel == 0) {
        if (!this._fixedParams) {
            this._init(this._getParams(data));
        } else {
            this._memoLevel = 1;
        }
        this._mat = SceneJS._math_scalingMat4v([this._x, this._y, this._z]);
    }
    var superXform = SceneJS._modelViewTransformModule.getTransform();
    if (this._memoLevel < 2) {
        var instancing = SceneJS._instancingModule.instancing();
        
        //////////////////////////
        // calculate memoLevel
        //////////////////////////

        if (this._memoLevel == 1 && superXform.fixed && !instancing) {   // Bump up memoization level if model-space fixed
            this._memoLevel = 2;
        }
        
        var tempMat = SceneJS._math_mulMat4(superXform.matrix, this._mat);
        this._xform = {
            localMatrix: this._mat,
            matrix: tempMat,
            fixed: this._memoLevel == 2    ///// Mark matrix on stack as fixed if at memoLevel 2
        };
      
    }
    SceneJS._modelViewTransformModule.setTransform(this._xform);
    this._renderNodes(traversalContext, data);
    SceneJS._modelViewTransformModule.setTransform(superXform);
};