Using Sandy 3D AS3, fill the viewport (exact fit) with multiple 3D objects

I'm stitching together an image using multiple instances of the sandy.primitive.Box. Each box is 96x91 while the viewport is 960x273 which should make fo开发者_开发问答r an exact fit if I layout the boxes in a perfect grid of 10x3. However, I can't seem to get the exact camera fieldOfView. I've tried a couple formulas (one for adjusting the "focal length" and one for adjusting the fov, directly). Both of these formulas produce a fov angle that is too narrow.

// focal length
(stage.stageHeight/2) / Math.tan(cam.fov / 2 * Math.PI / 180)

// field of view
2 * Math.atan2( (stage.stageHeight/2), -cam.z ) * (180 / Math.PI)

Another question about the same project: I need to adjust the perspective of each cube so that the image appears to be in 2D space (flat)... Any ideas on the best method for calculating such a "correction"?

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I realized shortly after posing this question that I wasn't taking into account the cubes' depth (actually, half of the depth) when determining the distance.

// field of view
2 * Math.atan2( (stage.stageHeight/2), -(cam.z + (cubeDepth/2)) ) * (180 / Math.PI)