Geometric lower body blur

I want to achieve this effect, Is there a similar example, please

Reminds me about this: Cheap misty effect


This is a good example. How can I change the white blur in this example to slowly transparent

you can modify the onBeforeCompile to include
gl_FragColor.a = 1.0 - planeFog;
making sure transparent is set to true on the material

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Thank you very much, the effect is very good, my initial idea is to start from one of the bottom vertices of the cube, randomly find enough points, reduce their transparency, I will learn shader, understand the idea of starting from shader