blender has built in vr export

 Howto using cycles - 

Blender Tutorial: How to render VR 360 degree, stereoscopic 3D - YouTube

Checkbox for stereoscopy in output properties, if we want stereoscopic. Also need to change Views to Stereo3D in Output properties. And we can choose the Stereo Mode to be Anaglyph, top/bottom, etc.

Then Camera type Panoramic, and Panorama type Equirectangular. (For fisheye for the dome, Equisolid gives me good results with the output circle fitting the output square exactly.) And check spherical stereo if needed.