5,336
edits
Perlin noise: Difference between revisions
no edit summary
No edit summary |
No edit summary |
||
| Line 3: | Line 3: | ||
# Generate a grid of random unit-length vectors | # Generate a grid of random unit-length vectors | ||
#* In improved perlin noise, vectors which only contain +=1 and 0 such as (1, 1, 0) are used | #* In improved perlin noise, vectors which only contain +=1 and 0 such as (1, 1, 0) are used | ||
# For each point, find the closest corners in the grid and compute the dot product between the vector from the corner and the corner's random vector. | # For each point, find the closest corners in the grid and compute the dot product between the vector from the corner and the corner's random vector. This results in 4 values for each pixel, one for each corner. | ||
# Interpolate between these using smoothstep. | # Interpolate between these using smoothstep. | ||
#* In improved perlin noise, use smootherstep which has zero first and second derivatives at the boundaries: | #* In improved perlin noise, use smootherstep which has zero first and second derivatives at the boundaries: | ||