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/**
* Methods related to projections
* @name ___METHODS_FOR_PROJECTIONS___
* @memberof rglwidgetClass
* @kind function
* @instance
*/
/**
* Get the viewport
*/
rglwidgetClass.prototype.getViewport = function(id) {
var vp = this.getObj(id).par3d.viewport,
x = vp.x*this.canvas.width,
y = vp.y*this.canvas.height,
width = vp.width*this.canvas.width,
height = vp.height*this.canvas.height;
this.vp = {x:x, y:y, width:width, height:height};
};
/**
* Set the gl viewport and scissor test
* @param { number } id - id of subscene
*/
rglwidgetClass.prototype.setViewport = function(id) {
var gl = this.gl || this.initGL();
this.getViewport(id);
gl.viewport(this.vp.x, this.vp.y, this.vp.width, this.vp.height);
gl.scissor(this.vp.x, this.vp.y, this.vp.width, this.vp.height);
gl.enable(gl.SCISSOR_TEST);
};
/**
* Set the projection matrix for a subscene
* @param { number } id - id of subscene
*/
rglwidgetClass.prototype.setprMatrix = function(id) {
var subscene = this.getObj(id),
embedding = subscene.embeddings.projection;
if (embedding === "replace")
this.prMatrix.makeIdentity();
else
this.setprMatrix(subscene.parent);
if (embedding === "inherit")
return;
// This is based on the Frustum::enclose code from geom.cpp
var bbox = subscene.par3d.bbox,
scale = subscene.par3d.scale,
ranges = [(bbox[1]-bbox[0])*scale[0]/2,
(bbox[3]-bbox[2])*scale[1]/2,
(bbox[5]-bbox[4])*scale[2]/2],
radius = Math.sqrt(this.sumsq(ranges))*1.1; // A bit bigger to handle labels
if (radius <= 0) radius = 1;
var observer = subscene.par3d.observer,
distance = observer[2],
FOV = subscene.par3d.FOV, ortho = FOV === 0,
t = ortho ? 1 : Math.tan(FOV*Math.PI/360),
near = distance - radius,
far = distance + radius,
hlen,
aspect = this.vp.width/this.vp.height,
z = subscene.par3d.zoom,
userProjection = subscene.par3d.userProjection;
if (far < 0.0)
far = 1.0;
if (near < far/100.0)
near = far/100.0;
this.frustum = {near:near, far:far};
hlen = t*near;
if (ortho) {
if (aspect > 1)
this.prMatrix.ortho(-hlen*aspect*z, hlen*aspect*z,
-hlen*z, hlen*z, near, far);
else
this.prMatrix.ortho(-hlen*z, hlen*z,
-hlen*z/aspect, hlen*z/aspect,
near, far);
} else {
if (aspect > 1)
this.prMatrix.frustum(-hlen*aspect*z, hlen*aspect*z,
-hlen*z, hlen*z, near, far);
else
this.prMatrix.frustum(-hlen*z, hlen*z,
-hlen*z/aspect, hlen*z/aspect,
near, far);
}
this.prMatrix.multRight(userProjection);
};
/**
* Set the model-view matrix for a subscene
* @param { number } id - id of the subscene
*/
rglwidgetClass.prototype.setmvMatrix = function(id) {
var observer = this.getObj(id).par3d.observer;
this.mvMatrix.makeIdentity();
this.setmodelMatrix(id);
this.mvMatrix.translate(-observer[0], -observer[1], -observer[2]);
};
/**
* Set the model matrix for a subscene
* @param { number } id - id of the subscene
*/
rglwidgetClass.prototype.setmodelMatrix = function(id) {
var subscene = this.getObj(id),
embedding = subscene.embeddings.model;
if (embedding === "replace") {
var bbox = subscene.par3d.bbox,
center = [(bbox[0]+bbox[1])/2,
(bbox[2]+bbox[3])/2,
(bbox[4]+bbox[5])/2];
this.mvMatrix.translate(-center[0], -center[1], -center[2]);
}
if (embedding !== "inherit") {
var scale = subscene.par3d.scale;
this.mvMatrix.scale(scale[0], scale[1], scale[2]);
this.mvMatrix.multRight( subscene.par3d.userMatrix );
}
if (embedding !== "replace")
this.setmodelMatrix(subscene.parent);
};
/**
* Set the normals matrix for a subscene
* @param { number } subsceneid - id of the subscene
*/
rglwidgetClass.prototype.setnormMatrix2 = function() {
this.normMatrix = new CanvasMatrix4(this.mvMatrix);
this.normMatrix.invert();
this.normMatrix.transpose();
};
/**
* Set the combined projection-model-view matrix
*/
rglwidgetClass.prototype.setprmvMatrix = function() {
this.prmvMatrix = new CanvasMatrix4( this.mvMatrix );
this.prmvMatrix.multRight( this.prMatrix );
};
rglwidgetClass.prototype.setInvPrMatrix = function() {
this.invPrMatrix = new CanvasMatrix4( this.prMatrix );
this.invPrMatrix.invert();
this.invPrMatrix.transpose();
};
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