Gerstner Wave Ocean Shader

This is vertex shader code for my ocean shader using gerstner waves tutorial. I wrote a complete tutorial that you can follow to understand how to make it. This code is a bit raw & needs refinement before use (for example: I have passed normalize(vector) in parameter, however, its better to normalize in function to ensure reliability).

Shader code
shader_type spatial;

uniform vec2 testdirection;
uniform float speeed;
uniform float steeepness : hint_range(0.0, 1.0, 0.05) = 1.0;
uniform float aamplitude = 1.0;
uniform float waavelength = 1.0;

// direction.y represents z axis (since it is 2D vec)
vec3 gerstner(vec3 vertex, vec2 direction, float time, float speed, float steepness, float amplitude, float wavelength){
	float displaced_x = vertex.x + (steepness/wavelength) * direction.x * cos(wavelength * dot(direction, vertex.xz) + speed * time);
	float displaced_z = vertex.z + (steepness/wavelength) * direction.y * cos(wavelength * dot(direction, vertex.xz) + speed * time);
	float displaced_y = vertex.y + amplitude * sin(wavelength * dot(direction, vertex.xz) + speed * time);
	return vec3(displaced_x, displaced_y, displaced_z);
}

vec3 gerstner_normal(vec3 vertex, vec2 direction, float time, float speed, float steepness, float amplitude, float wavelength) {
    float cosfactor = cos(wavelength * dot(direction, vertex.xz + speed * time));
	float sinfactor = sin(wavelength * dot(direction, vertex.xz + speed * time));
	float x_normal = -direction.x * wavelength * amplitude * cosfactor;
	float z_normal = -direction.y * wavelength * amplitude * cosfactor;
	float y_normal = 1.0 - (steepness/wavelength) * wavelength * amplitude * sinfactor;
	return vec3(x_normal, y_normal, z_normal);
}

void vertex(){
	VERTEX = gerstner(VERTEX, normalize(testdirection), TIME, speeed, steeepness, aamplitude, waavelength);
	NORMAL = gerstner_normal(VERTEX, normalize(testdirection), TIME, speeed, steeepness, aamplitude, waavelength);
}
Tags
3d ocean, gerstner wave, ocean shader
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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