Scope for code optimization

[mghildiy]

Hi,

In render.js:

Inside for loop in ParticleSystemBatcher.prototype.push

var x = p.position[0] * lasBuffer.scale[0] + lasBuffer.offset[0];
Later on:
positions[ 3*i ] = p.position[0] * lasBuffer.scale[0] + (lasBuffer.offset[0] - this.corrective.x);
This is same as:
positions[ 3*i ] = x - this.corrective.x

Similar for y and z coordinates.

With huge number of points, avoiding this recomputation may help in improving the performance.

PS:If permitted, I can commit this change.

[verma]

Please submit a PR and we can take it from there.