gistfile1.coffee

return class Sun extends require('events')
    constructor: (gui, @bounds, @orientation=104, @elevation=60) ->
        gui.remember @
        super()
        folder = gui.addFolder('Sun')
        folder.add(@, 'orientation', 0, 360).onChange(@update)
        folder.add(@, 'elevation', 0, 90).onChange(@update)

        @size = @bounds.size.length
        @center = @bounds.min.add(@bounds.size.div 2, new Vec3)

        @near = -1
        @far = 100

        @updateProjection()
        @view = new Mat4()
        @rot = new Mat3()

        @update(true)

    update: (clipping) =>
        @view.identity()
            .translateVal3(0, 0, -@size)
            .rotatex(@elevation)
            .rotatey(@orientation)
            .translateVal3([email protected], [email protected], [email protected])
            .toMat3 @rot.identity()

        if clipping
            @updateClipping()
            @updateProjection()
            @update(false)

        @trigger('change')
        return @

    updateClipping: ->
        vertices = @bounds.vertices
        view_inv = @view.invert(new Mat4())
        for v in vertices
            @view.mulVec3(v)
        z = vertices.map (v) -> v.z
        @near = Math.min.apply(0, z)
        @far = Math.max.apply(0, z)
        console.log(@near, @far)

    updateProjection: ->
        @proj = new Mat4().ortho(@near, @far, @size/1.5, -@size/1.5, -@size/1.5, @size/1.5)