Game Development Reference
In-Depth Information
}
}
//
var nBones = this.bones.length;
this.boneMatrices = new Float32Array( 16 * nBones );
this.pose();
}
}
The
loadObject
function overrides the
StageObject
class'
loadObject
function.
It does everything that
StageObject
does, such as it invokes
parseJSON
and it
initializes materials. It also parses the skin and populates the geometry with the
skinIndices
and
skinWeights
data.
Then, it iterates over the
bones
array and initializes a bone object for each element of
the array. It reads the
position
,
quaternion
and
scale
values from the
bones
array
element and adds the newly created bone object to the
bones
array.
Then, it creates the tree hierarchy. It iterates over all bone elements and if the value
of
parent
of the bone is
-1
, it adds the bone as its child element; otherwise, it adds
the bone to the corresponding bone's parent,
(this.bones[ gbone.parent ].add(
bone );)
. The
parent
attribute of the bone element holds the indices of the bone.
Hence, we first retrieve the parent bone object by using the
this.bones[ gbone.
parent]
code and then add the bone to its parent.
It invokes the
this.pose()
function after initializing the bone objects, which in turn
invokes
updateMatrixWorld
, which creates the initial world space matrix for each
bone. The
createBuffers
function is defined as follows:
RiggedMesh.prototype.createBuffers=function(gl) {
...
this.skinIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.skinIndexBuffer);
gl.bufferData(gl.ARRAY_BUFFER,
new Float32Array(this.geometry.skinIndices), gl.STATIC_DRAW);
this.skinIndexBuffer.itemSize = 4;
this.skinIndexBuffer.numItems =
this.geometry.skinIndices.length/4;
this.skinWeightBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.skinWeightBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new
Float32Array(this.geometry.skinWeights), gl.STATIC_DRAW);
this.skinWeightBuffer.itemSize = 4;
this.skinWeightBuffer.numItems =
this.geometry.skinWeights.length/4;
...
}
