Why does the 3D viewer crop my jpegs at some rotations?

I've built a 3D GPR viewer in Matlab. Because of the data volumes involved, I took the following steps:

- read in the data from binary radar files

- process the data

- assign a colormap

- create a jpeg of each radargram using the colormap and other input parameters

- load all of the jpegs

- use hgtransform to position them on 3D axes

- load info on boreholes and other features

- plot the additional info with the images.

All of this works, to varying degrees (I need to do some tweaking, but I'm happy with how the code runs, and the viewer's response is fast -whereas when I was plotting actual data it just crashed).

My question is: why does the viewer crop my images to varying degrees during rotation of the axes in the viewer, and is it possible to prevent this?

I've attached two screengrabs. The first shows the axes at an initial rotation, where the images are not cropped. the second shows the same axes after a secondary rotation, when the cropping is at its worst.

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