2. Delete all lights in MAX.

3. Open the renderer and switch to the "mentalray" renderer.

4. In the Sampling Mode under the Renderer panel, change it to Classic/Ray Tracing.

5. In the GI panel, turn off the global light (remove the check mark in front).

6. Select all models and give a shader.

7. Change the "diffuse reflection" in the shader to pure white and the "self-luminescence" to 100.

8. In the channel before diffuse reflection, add "am am independent/reflective occlusion".

9. The reference value of the first arrow is "16 or 32", the reference value of the second arrow is 128, and nothing else needs to be moved.

10, and finally click the environment panel.

1 1, change the sky background color to pure white.

12. Render the graph and save it.

13. Import two pictures into PS, and the AO picture will be superimposed into one picture in the form of positive overlapping (if necessary, the color scale of the AO picture can be adjusted to adjust the effect).