Add octagonal shape and 12-gon shape.[Update]
Add rendering precision (Auto / 32 bit float / 32 bit int / 64 bit double).So far, when the radius is small, the problem that the gain did not work much has been corrected.
At the time of updating, there are cases where the operation different from the conventional rendering is performed. Legacy precision considering compatibility with the past was added.
Fixed the problem that the picture was broken at 32 bit composition