function 'getframe' can't capture figures with transparent objects?

I used trisurf to draw a 3-D polyhedron and wanted to record the figures when rotating it, saving as a *.gif file.

However, once I added 'facealpha' value to trisurf function, like

trisurf(k,x,y,z,'facealpha',.8);

then the getframe(gcf) can't record the frame when rotating, but just the first frame when record began. Once the facealpha was removed, everything went well.

So how should I record a GIF with transparent object?