To apply opacity to a 3D model, adjust the “alpha” or “opacity” value in the model’s material settings using 3D software (e.g., Blender, Unity, Maya).
This value controls transparency—lower numbers make the model more see-through, ideal for effects like glass, smoke, or semi-transparent fabrics. You’ll also need to enable alpha blending in the software’s render or shader settings to display the transparency correctly.
For beginners, try a basic cube in Blender: go to Material Properties > Transparency, then drag the Alpha slider below 1.0 to test different opacity levels easily.