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What I want is assign the black color as an alpha or transparent, then the red color as a normal shader. I'm using EEVEE. My render result: My render result

What I actually want (edited in external app) :My render expectation

My node:enter image description here

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Oh my actually it's simple, I use wrong shader. It should be principled BSDF, not emission. So what actually to do is: - Set black color of color ramp to alpha. Decrease alpha value to zero should work - Color output of color ramp must be connected to color of Principled BSDF, and alpha output to alpha input.enter image description here

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