Iray is integrated directly into Rhino's viewports to provide you continual, realistic feedback as you craft your model's form, materials & lighting.

GRay - Generative Materials for V-Ray 2 and V-Ray 3 for Rhino

Thea for Rhino creates high-quality photorealistic renders within Rhino 6 / 7 / 8 with unbiased and GPU engines.