64 lines
2.8 KiB
HLSL
64 lines
2.8 KiB
HLSL
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float3 GerstnerWave(float3 position, float steepness, float wavelength, float speed, float direction, inout float3 tangent, inout float3 binormal, float globalOffset)
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{
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// Normalizar la dirección para la propagación de la ola
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direction = direction * 2 - 1;
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float2 d = normalize(float2(cos(3.14159 * direction), sin(3.14159 * direction)));
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// Número de onda
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float k = 2 * 3.14159 / wavelength;
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// Calcular la fase de la ola, incluyendo el desplazamiento global
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float f = k * (dot(d, position.xz) - speed * _Time.y + globalOffset);
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// Amplitud de la ola
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float a = steepness / k;
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// Ajustar el tangente y el binormal para las normales
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tangent += float3(
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-d.x * d.x * (steepness * sin(f)),
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d.x * (steepness * cos(f)),
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-d.x * d.y * (steepness * sin(f))
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);
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binormal += float3(
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-d.x * d.y * (steepness * sin(f)),
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d.y * (steepness * cos(f)),
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-d.y * d.y * (steepness * sin(f))
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);
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// Retornar el desplazamiento de la ola en el plano XZ y la altura vertical
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return float3(
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d.x * (a * cos(f)), // Desplazamiento en X
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a * sin(f), // Desplazamiento en Y (altura)
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d.y * (a * cos(f)) // Desplazamiento en Z
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);
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}
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void GerstnerWaves_float(float3 position, float steepness, float wavelength, float speed, float4 directions, float tileSize, out float3 Offset, out float3 normal)
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{
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// Calcular el desplazamiento global para las olas en base a la posición absoluta
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float globalOffsetX = floor(position.x / tileSize) * tileSize;
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float globalOffsetZ = floor(position.z / tileSize) * tileSize;
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// Envolver la posición X y Z usando fmod para asegurar el tileado, manteniendo el Y sin cambios
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float3 tiledPosition = float3(
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fmod(position.x, tileSize), // Envolver eje X
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position.y, // Y sin cambios
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fmod(position.z, tileSize) // Envolver eje Z
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);
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// Inicializar el desplazamiento y los vectores de tangente/binormal
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Offset = float3(0, 0, 0);
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float3 tangent = float3(1, 0, 0);
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float3 binormal = float3(0, 0, 1);
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// Aplicar las olas Gerstner a las direcciones, con el desplazamiento global en X y Z
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Offset += GerstnerWave(tiledPosition, steepness, wavelength, speed, directions.x, tangent, binormal, globalOffsetX + globalOffsetZ);
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Offset += GerstnerWave(tiledPosition, steepness, wavelength, speed, directions.y, tangent, binormal, globalOffsetX + globalOffsetZ);
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Offset += GerstnerWave(tiledPosition, steepness, wavelength, speed, directions.z, tangent, binormal, globalOffsetX + globalOffsetZ);
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Offset += GerstnerWave(tiledPosition, steepness, wavelength, speed, directions.w, tangent, binormal, globalOffsetX + globalOffsetZ);
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// Normalizar el producto cruzado de binormal y tangente para obtener la normal
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normal = normalize(cross(binormal, tangent));
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}
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