-----> Octane Falloff Texture

The Falloff node can be used to control the blend of two materials depending on the viewing angle of the material's geometry. This can help simulate coating effects commonly visible in the reflective quality of car paint, glass windows, X-Ray effects, and velvet.  Integrating the Falloff texture into a shader network allows you to create a custom Fresnel control for any particular channel and is particularly useful when used to control the Amount parameter of a Mix texture or Mix material.

Figure 1 shows a Falloff texture controlling the amount parameter of a Mix texture which blends an orange and blue RGB Spectrum texture nodes. The result is connected to the Diffuse channel of an Octane shader.

Figure 1 : A Falloff texture is used to control the Amount parameter of a Mix texture node.

Falloff Node Parameters

Mode
This menu has three options for determining how falloff is calculated.

• Normal vs. eye ray  means that falloff is determined by normal versus glancing angles. This is the most conventional setting.

• Normal vs. vector 90deg means that falloff is determined by normal versus an angle specified in the fields below the meun multiplied by 90 degrees.

• Normal vs. vector 180deg means that falloff is determined by normal versus an angle specified in the fields below the meun multiplied by 180 degrees.

Minimum Value
This parameter controls the value of the of the falloff texture as it appears on the parts of the surface that face the viewer also known as the “normal” angle .

Maximum Value
This parameter controls the value of the of the falloff texture as it appears on the parts of the surface that turn away from the viewer also known as “glancing” or “grazing” angles.

Falloff Skew Factor
This parameter is used to balance the influence of the normal and grazing angles. A low value means that the influence of the grazing angle is stronger and any textures controlled by the falloff Maximum value will cover more of the surface. Higher Skew Factor settings result in a stronger influence of the normal angle  and any textures controlled by the Minimum value will cover more of the surface.