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I want to make a cube look like made out of glass. I know how to give it transparency but I don't know how to make it reflect light like glass in real life do

(Blender version 2.9)

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  • $\begingroup$ Please edit your post to specify whether you want it to be realistic (in Cycles) or realtime (in Eevee)? $\endgroup$
    – HISEROD
    Jan 31 '21 at 6:39
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Use a glass shader.

The Glass BSDF is used to add a Glass-like shader mixing refraction and reflection at grazing angles. Like the transparent shader, only pure white will make it transparent

Color
Color of the surface, or physically speaking, the probability that light is ransmitted for each wavelength

Roughness
Influences sharpness of the refraction; perfectly sharp at 0.0 and smoother with higher values.

IOR
Index of refraction (IOR) defining how much the ray changes direction. At 1. 0 rays pass straight through like transparent; higher values give more refraction.

Normal
Normal used for shading.

https://docs.blender.org/manual/en/latest/render/shader_nodes/shader/glass.html?highlight=glass

enter image description here

For reflections, set something in the scene or the environment that will be reflected on the surface.

Read:

How to turn off reflections on glass

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