NEW IN R20
Fresnel ConductorPreview Basic Inputs Outputs Context
Each metallic material can be defined via its refraction index and its absorption. This is why this Node contains a list of presets defining some commonly used metallic materials. The vector for the Refraction Index defines the material’s light refracting properties individually for red, green and blue components of the incoming light. This also affects the reflective properties, which are calculated with different strengths depending on the angle from which the surface is viewed. Generally speaking, higher Refraction Index values produce correspondingly stronger reflections.
The Absorption method works even more precisely on reflections, which can also be controlled separately for red, green and blue light components. Larger Absorption values lead to correspondingly stronger reflections in the respective color components.
This Node does not in fact trace reflections but only returns angle-dependent weights. You may of course use these weights to attenuate actual reflections such as those traced by the Trace Ray node.