Utility Nodes
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Utility Nodes

 

In the Shader Designer, utility nodes represent common, useful shader calculations that don't fit neatly into the other categories. Some utility nodes perform simple operations such as appending vectors together or choosing results conditionally, and others perform complex operations such as computing lighting contributions according to popular lighting models.

Node

Details

Properties

Append Vector

Creates a vector by appending the specified inputs together.

Input:

Vector: float, float2, or float3

The values to append to.

Value to Append: float

The value to append.

Output:

Output: float2, float3, or float4 depending on the type of input Vector

The new vector.

None

Fresnel

Computes the Fresnel fall-off based on the specified surface normal.

The Fresnel fall-off value expresses how closely the surface normal of the current pixel coincides with the view vector. When the vectors are aligned, the result of the function is 0; the result increases as the vectors become less similar, and reaches its maximum when the vectors are orthogonal. You can use this to make an effect more or less apparent based on the relationship between the orientation of the current pixel and the camera.

Input:

Surface Normal: float3

The surface normal of the current pixel, defined in the current pixel's tangent space. You can use this to perturb the apparent surface normal, as in normal mapping.

Output:

Output: float

The reflectivity of the current pixel.

Exponent

The exponent that's used to calculate the Fresnel fall-off.

If

Conditionally chooses one of three potential results per component. The condition is defined by the relationship between two other specified inputs.

For each component of the result, the corresponding component of one of the three potential results is chosen, based on the relationship between the corresponding components of the first two inputs.

Input:

X: float, float2, float3, or float4

The left-hand side value to compare.

Y: same type as input X

The right-hand side value to compare.

X > Y: same type as input X

The values that are chosen when X is greater than Y.

X = Y: same type as input X

The values that are chosen when X is equal to Y.

X < Y: same type as input X

The values that are chosen when X is less than Y.

Output:

Output: float3

The chosen result, per component.

None

Lambert

Computes the color of the current pixel according to the Lambert lighting model, by using the specified surface normal.

This color is the sum of ambient color and diffuse lighting contributions under direct lighting. Ambient color approximates the total contribution of indirect lighting, but looks flat and dull without the help of additional lighting. Diffuse lighting helps add shape and depth to an object.

Input:

Surface Normal: float3

The surface normal of the current pixel, defined in the current pixel's tangent space. You can use this to perturb the apparent surface normal, as in normal mapping.

Diffuse Color: float3

The diffuse color of the current pixel, typically the Point Color. If no input is provided, the default value is white.

Output:

Output: float3

The diffuse color of the current pixel.

None

Mask Vector

Masks components of the specified vector.

You can use this to remove specific color channels from a color value, or to prevent specific components from having an effect on subsequent calculations.

Input:

Vector: float4

The vector to mask.

Output:

Output: float4

The masked vector.

Red / X

False to mask out the red (x) component; otherwise, True.

Green / Y

False to mask out the green (y) component; otherwise, True.

Blue / Z

False to mask out the blue (z) component; otherwise, True.

Alpha / W

False to mask out the alpha (w) component; otherwise, True.

Reflection Vector

Computes the reflection vector for the current pixel in tangent space, based on the camera position.

You can use this to calculate reflections, cubemap coordinates, and specular lighting contributions

Input:

Tangent Space Surface Normal: float3

The surface normal of the current pixel, defined in the current pixel's tangent space. You can use this to perturb the apparent surface normal, as in normal mapping.

Output:

Output: float3

The reflection vector.

None

Specular

Computes the specular lighting contribution according to the Phong lighting model, by using the specified surface normal.

Specular lighting gives a shiny, reflective appearance to an object, for example, water, plastic, or metals.

Input:

Surface Normal: float3

The surface normal of the current pixel, defined in the current pixel's tangent space. You can use this to perturb the apparent surface normal, as in normal mapping.

Output:

Output: float3

The color contribution of specular highlights.

None

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