White Noise Texture Node#

The White Noise Texture node returns a random number based on an input Seed. The seed can be a number, a 2D vector, a 3D vector, or a 4D vector; depending on the Dimensions property. The output number ranges between zero and one.

White Noise Texture Node.

輸入#

The inputs are dynamic, they become available if needed depending on the node properties.

Vector

Vector used as seed in 2D, 3D, and 4D dimensions.

W

Value used as seed in 1D and 4D dimensions.

屬性#

Dimensions

The dimensions of the space to evaluate the noise in.

1D:

The W input is used as seed.

2D:

The X and Y components of the Vector input are used as seed.

3D:

The Vector input is used as seed.

4D:

Both the Vector input and the W input are used as seed.

輸出#

Value

Output random value.

色彩

Output random color.

Notes#

The slightest difference in seed values would result in completely different outputs. Consequently, bad precision may have significant impact on the output. Usually, we can mitigate this issue by:

  • Eliminating the problematic seed value. If the problematic seed value is constant, it should be eliminated by choosing a lower dimension or multiplying it by zero.

  • Adding an arbitrary value to the seed. The issue might only happen at certain boundaries, like unit boundaries, so simply adding an arbitrary value might solve the issue.

  • Taking the absolute value of the seed. In computing, zero may be positive or negative, so taking the absolute values unifies the zero into a single value.

../../../_images/render_shader-nodes_textures_white-noise_issue.png

Precision issue due to signed zeros on the Z axis.#

../../../_images/render_shader-nodes_textures_white-noise_solution1.png

Mitigating the issue by eliminating the Z axis.#

../../../_images/render_shader-nodes_textures_white-noise_solution2.png

Mitigating the issue by adding an arbitrary value.#

../../../_images/render_shader-nodes_textures_white-noise_solution3.png

Mitigating the issue by taking the absolute value.#

範例#

../../../_images/render_shader-nodes_textures_white-noise_solution1.png

Generating cell noise using the Snap vector operation and the White Noise node.#