don't render to the file

Change-Id: I8cf4b25c84564c0cb3195c5b63d0dde6d78d7080
fix size of graphic

Change-Id: I2317083eca1034fe1d69b8716304c9f6d5cf5067
a bit more clean-up

Change-Id: Ib6a3ef54fdd7b0582b691ae5e4d2ff998bd17b54
only use one variable for alpha

It was confusing and in some places we already used the wrong variable.

Change-Id: Ib3a0f0e500530be0b502301233e5e853abe9f889
try to use orthographic projection

Change-Id: I6e0baf23cea7d1883ca910ee13819ea58bbf7695