Im trying to get a sponge type material. like this
Uptill now i have tried this.
But my result not near to it.
I know its lot missing anybody help me how to get that material.
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I would use a much simpler setup:
Math > Round to make texture black and white and Math > Multiply to control Volume Density.
You can use different textures to get different results, I've made examples above with Noise, Voronoi and Wave.
As always with Volume Shaders don't forget to crank up Ligth Paths > Volume to something more than 0.