Consider everything that you might already know with regard to thermoforming of plastic sheets (Wikipedia) to be possible for glass as well.
Most glasses with coefficient of thermal expansion (CTE) between 3.2 and 9.0 µm/m*K; e.g.:
up to 510 x 840mm
0.3 mm up to 40 mm
Please be aware that the process is a single side tool based process. Thus it is only possible to directly control one side of the part. The other side is a mandatory result of the tool topography and the material thickness used.
In most cases it is possible to use either a female or a male mould approach. Thus you can control the side of the product that is of higher interest to you.
Radius: Tool side: down to 0 (sharp edge)
Air side (non tool side): minimum radius = thickness of the glass
Stretching of the thickness: App. 5% of the glass thickness per mm cavity hight/depth.
Please be aware that this value is strongly influenced by the overall design. Real values can vary to the plus or the minus. For critical applications we do recommend to run tests based on the real design for evaluation!
Surface: Smooth, rough, structured; uniformly or combined