Interesting news of a “really real-time” renderer for Cinema 4D, thus potentially interfacing with imported scene files from Poser. U-Render works on Cinema 4D R16 and upwards, is OpenGL 4.5-based and is GPU agnostic (Nvidia or AMD). Poser 11 Pro’s PoserFusion plugin supported Cinema 4D to R19. Thus it should be theoretically possible to import a Poser scene to C4D and have it render in real-time.
U-Render is somewhat affordable at $329 (currently with a 33% discount offer). In its latest 2019.11 version it newly supports volumetrics.
The only major drawback seems to be that U-Render is developed for the toxic tangle that is Windows 10. But there’s a 30-day free trial to test it — please comment here if you find you can actually get it running under Windows 8.1.x.
One wonders if this could be plugged more directly into a future Poser 12, too, perhaps as a $199 plugin.
Incidentally, if you’re inclined to ask “what version of OpenGL am I running”, then be very wary of installing the commonly-suggested GL View utility to find out. It will bring your PC to a grinding halt for two hours while it does its intense tests, and it cannot be halted no matter how many times you press Crtl + Alt + Del. The only way to kill it is to remove the power-cable and kill Windows. This makes it highly dangerous for most users. It’s not intended to be malware, but its aggressive system-hogging, and lack of asking user permissions or offer of slower probing, effectively make it so.
The far easier way is the portable freeware GPU Caps Viewer. This is very light on your PC and indeed takes just half a second to give you the answer. I’m on OpenGL 4.2.
Update: installing new GPU display drivers upgraded me to OpenGL 4.5.