The primary challenge of achieving photorealistic quality in real-time rendering is balancing high visual fidelity with strict real-time performance demands (typically 30-60 FPS), limiting computational resources for realistic elements.
Key constraints include: - Realistic lighting (e.g., global illumination) and high-res textures, requiring significant GPU memory/processing. - Dynamic elements (e.g., smooth anti-aliasing) and accurate materials (e.g., reflections, subsurface scattering), straining CPU/GPU.
Mitigations involve optimizations like level-of-detail (LOD) models, baked lighting, or AI upscaling to balance quality and performance.