Demand Analysis of Indirect lighting

Yesterday, I tried to make the cup on my desk into a 3D image. It took nearly a day to use Mental Ray rendering and I could not get the desired result. I would like to summarize my comments on Mr Indirect lighting as follows, we hope that the emergence of Elvish Ray can solve these problems, which is also a requirement analysis:

1. the energy of photon is too difficult to adjust, so it will never work out. After a long try, we will find that the energy is not large enough.
2. After adjusting the photon energy size, if the photon texture is not re-rendered, no new results will be displayed.
3. reflection and refraction are very slow after opening.
4. It is difficult to adjust parameters such as the number of samples, the photon radius, and the size of the filter. It is required to be tested for many times. Each rendering is slow and the result cannot be previewed in real time.
5. You need to adjust many parameters, such as material parameters, lighting parameters, and object attributes to achieve the desired effect, which is difficult to use.
6. rendering speed is too slow. It takes a long time to adjust parameters for feedback.
7. The facular shapes produced by focal points differ greatly from those of real objects.
8.AlgorithmDue to its discrete approximation, the image is prone to flaws, and a single photon or noise spot is displayed, which affects the appearance of the image.

PS: It seems that the current Elvish Ray prototype is very similar to Mr, and there are also these problems.