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How to achieve refined ambient occlusion in Three.js to obtain subtle shadow effects similar to those shown in the picture?
How to achieve refined ambient occlusion in Three.js to obtain subtle shadow effects similar to those shown in the picture?
Apr 04, 2025 pm 03:03 PM
Three.js fine ambient light occlusion shadow effect implementation detailed explanation
This article discusses how to implement fine ambient occlusion (AO) shadow effects similar to those shown in the figure below in Three.js, rather than simple global shadows. The goal is to reproduce the subtle shadow details that appear at the angle between the two faces in the figure.
Although the post-processing effects such as SSAOPass, SAOPass and GTAOPass of Three.js can achieve AO, the results are usually rough and will cover the entire model surface. To obtain the fine shadows shown in the figure, fine-tuning of the AO algorithm parameters is required.
Key parameters and their impact:
- Radius: Controls the sampling range of the AO algorithm. Smaller radii produce finer shadows, but more cost-effective in computing; larger radii produce blurry shadows, which are less cost-effective in computing.
- Intensity: Controls the intensity of the shadow.
- SampleCount: Increasing the number of samples can improve shadow fineness, but it can also significantly increase the amount of calculation.
- Bias: Adjust the shadow offset to help reduce defects such as self-occlusion.
In addition to parameter adjustment, the geometric details and complexity of the model are also crucial. Simple geometry or unclear angles are difficult to produce ideal shadowing effects even if a fine AO ??algorithm is used.
Therefore, achieving the target effect requires:
- Parameter iteration: It requires repeated trial and error to find the best parameter combination.
- Source code understanding: Only by deeply understanding the source code of SSAOPass or other AO algorithms can you adjust parameters more effectively.
- Model Optimization: Ensure that the model has sufficient geometric details to support fine AO ??effects.
By carefully adjusting parameters and combining scene and model characteristics, you can achieve satisfactory refined ambient occlusion shadowing effects in Three.js.
The above is the detailed content of How to achieve refined ambient occlusion in Three.js to obtain subtle shadow effects similar to those shown in the picture?. For more information, please follow other related articles on the PHP Chinese website!
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