What is the effect of 3d coloring on defocus?

In 3D rendering, there is the effect of light reflection and refraction convergence, which is called caustics. It can make 3D rendering more realistic. Make our rendering results more realistic; However, the corresponding costs are more computing resources and more rendering time costs.

Let's analyze how the C4d redshift renderer uses caustics.

Generally speaking, the common causticity in 3d rendering is the light spot formed when the light is refracted by a glass object and concentrated in a region.

1. will create a scene, a plane, a ball and an area light. Add the red-shifted glass material to the ball, which is preset with (glass).

One thing to say is that caustics can be seen without the global light of GI, because by default, red shift will separate the caustics of GI from the distribution of objects. If you want to use GI to affect caustics, you can only use one of the three photons. As long as photons emit sampled light from light, the other two algorithms emit sampled light from the camera.

2. To view the caustics in the rendered scene, first enable the photons of the area light.

IM is photon intensity and $ number is photon number. The following emission is the influence of GI global light on photons.

3. Caustics also need to be marked. Check the project of projecting focal astigmatism below.

4. Finally, turn on the photon behind GI in the rendering settings. Then close the progressive rendering channel, or click the 9 blocks to the right of the lock in the rendering window (sampling rendering, that is, the final result), and you can see good caustics.

5. Common caustics setting parameters

Photons in rendering settings. Reflection is the sampling depth of reflection causticity, reflection is the sampling depth of refraction causticity, and the causticity search radius is the causticity search radius (too small will produce optical noise, so it is better to adjust it larger. The principle is that the larger the radius, the blurring of the junction between photons will occur)

Caustics is a separate option of physical reality renderer in 3D rendering. If there are no special effects, the default settings of the renderer are generally adopted. Using caustics, we render real 3D scenes more realistically. But sometimes you can get some good results in animated scenes. As creators of three-dimensional art, we should flexibly use all the functions of software to serve our thoughts. Remember, you don't do things to use functions, you do things to use the functions of software.