Variable simpleTerrainVertexShaderConst
simpleTerrainVertexShader: "\n varying vec2 vUv;\n varying vec3 vPosition;\n varying vec3 vNormal;\n \n float hash(vec2 p) {\n return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453);\n }\n \n float noise(vec2 p) {\n vec2 i = floor(p);\n vec2 f = fract(p);\n f = f * f * (3.0 - 2.0 * f);\n \n float a = hash(i);\n float b = hash(i + vec2(1.0, 0.0));\n float c = hash(i + vec2(0.0, 1.0));\n float d = hash(i + vec2(1.0, 1.0));\n \n return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);\n }\n \n void main() {\n vUv = uv;\n \n vec3 pos = position;\n \n // Add terrain height variation using noise\n float terrainNoise = noise(pos.xz * 0.1) * 2.0;\n terrainNoise += noise(pos.xz * 0.05) * 4.0;\n pos.y += terrainNoise;\n \n vPosition = pos;\n \n // Calculate normal from noise derivatives\n float eps = 0.1;\n float nx = noise((pos.xz + vec2(eps, 0.0)) * 0.1) - noise((pos.xz - vec2(eps, 0.0)) * 0.1);\n float nz = noise((pos.xz + vec2(0.0, eps)) * 0.1) - noise((pos.xz - vec2(0.0, eps)) * 0.1);\n vNormal = normalize(vec3(-nx * 10.0, 1.0, -nz * 10.0));\n \n gl_Position = projectionMatrix * modelViewMatrix * vec4(pos, 1.0);\n }\n" = ...
Simple terrain shader for non-biome use
Lifted from Otterfall biome selector diorama.