How to create the shadow by using a custom pic like this?

website demo
The website gem model has the custom shadow like below:
I think it is made by this shadow pic:

I wonder how to achieve that effect?

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Hello, you can use contact shadow for this approach

Oh the sparkly’s on that look soo goood!!! 3D gemstones are starting look really good!


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I think so too. I also want to know how to achieve that effect. I use THREE.LensFlare to achieve, but it can’nt rotate. Like below:

Still have no time to obfuscate diamond spark code

Try drawing a rectangle on the ground and map the image to it.