private void UpdateShader()
{
var uniformScale = UniformScale;
var invScale = SGT_MatrixHelper.Scaling(SGT_Helper.Reciprocal(new Vector3(1.0f, 1.0f - gasGiantOblateness, 1.0f)));
var rot = SGT_MatrixHelper.Rotation(transform.rotation);
var invRot = SGT_MatrixHelper.Rotation(Quaternion.Inverse(transform.rotation));
var ellipsoid2sphere = rot * invScale * invRot;
var sphere2ellipsoid = ellipsoid2sphere.inverse;
var lightSourcePosition = SGT_Helper.GetPosition(gasGiantLightSource);
maxDepth = (gasGiantEquatorialRadius * uniformScale) / (atmosphereDensity * atmosphereDensity);
// Update shader variables
atmosphereMaterial.SetTexture("dayTexture", atmosphereDayTexture);
atmosphereMaterial.SetTexture("nightTexture", atmosphereNightTexture);
atmosphereMaterial.SetTexture("lightingTexture", lightingTexture);
atmosphereMaterial.SetMatrix("ellipsoid2sphere", ellipsoid2sphere);
atmosphereMaterial.SetVector("centrePosition", transform.position);
atmosphereMaterial.SetVector("starDirection", GasGiantLightSourceDirection);
atmosphereMaterial.SetFloat("falloff", atmosphereDensityFalloff * atmosphereDensityFalloff);
atmosphereMaterial.SetFloat("maxDepth", maxDepth);
if (shadow == true)
{
var cutoff = ShadowCasterRadiusInner / ShadowCasterRadiusOuter;
var invCutoff = SGT_Helper.Reciprocal(1.0f - cutoff);
var shadowValues = new Vector3(cutoff, invCutoff, 1.0f + ShadowCasterRadiusOuter);
var shadowMatrix = Matrix4x4.identity;
switch (shadowType)
{
case SGT_ShadowOccluder.Ring:
{
shadowMatrix = SGT_Helper.CalculateCircleShadowMatrix(ShadowCasterRadiusOuter, transform.position, transform.up, lightSourcePosition, transform.position, uniformScale);
shadowMatrix *= SGT_MatrixHelper.Translation(transform.position); // This is to remove one instruction in the VS
shadowMatrix *= sphere2ellipsoid;
}
break;
case SGT_ShadowOccluder.Planet:
{
if (shadowGameObject != null)
{
shadowMatrix = SGT_Helper.CalculateSphereShadowMatrix(ShadowCasterRadiusOuter, shadowGameObject.transform.position, lightSourcePosition, transform.position, uniformScale);
shadowMatrix *= SGT_MatrixHelper.Translation(transform.position); // This is to remove one instruction in the VS
}
}
break;
}
atmosphereMaterial.SetTexture("shadowTexture", shadowTexture);
atmosphereMaterial.SetMatrix("shadowMatrix", shadowMatrix);
atmosphereMaterial.SetVector("shadowValues", shadowValues);
}
}
private void UpdateShader()
{
var starDirection = planetLightSource != null ? (planetLightSource.transform.position - transform.position).normalized : Vector3.up;
var lightSourcePosition = planetLightSource != null ? planetLightSource.transform.position : Vector3.zero;
var transformPosition = transform.position;
var uniformScale = UniformScale;
var observerPosition = planetObserver != null ? planetObserver.transform.position : Vector3.zero;
var distance = (observerPosition - transformPosition).magnitude;
float maxSurfaceDepth, maxAtmosphereDepth;
SGT_Helper.CalculateHorizonAtmosphereDepth(surfaceRadius * uniformScale, AtmosphereRadius * uniformScale, distance, out maxSurfaceDepth, out maxAtmosphereDepth);
// Common shader variables
SGT_ShaderHelper.SetVector(surfaceMaterials, "centrePosition", transformPosition);
SGT_ShaderHelper.SetVector(surfaceMaterials, "starDirection", starDirection);
if (surfaceTextureNormal != null)
{
var starDirectionM = surfaceGameObject.transform.worldToLocalMatrix.MultiplyVector(starDirection).normalized;
SGT_ShaderHelper.SetVector(surfaceMaterials, "starDirectionM", starDirectionM);
}
if (atmosphereMaterial != null)
{
var altitudeUnclamped = distance - surfaceRadius * uniformScale;
var altitude = Mathf.Clamp(altitudeUnclamped, 0.0f, atmosphereHeight * uniformScale);
var atmoAlt = SGT_Helper.RemapClamped(atmosphereHeight * uniformScale * atmosphereSkyAltitude, atmosphereHeight * uniformScale, altitude, 0.0f, 1.0f);
SGT_ShaderHelper.SetFloat(surfaceMaterials, "maxDepth", maxSurfaceDepth * (1.0f - atmosphereFog)); // FOG
atmosphereMaterial.SetFloat("maxDepth", maxAtmosphereDepth);
atmosphereMaterial.SetVector("centrePosition", transformPosition);
atmosphereMaterial.SetVector("starDirection", starDirection);
atmosphereMaterial.SetFloat("atmosphereFalloff", Mathf.SmoothStep(atmosphereFalloffInside, atmosphereFalloffOutside, atmoAlt));
if (atmosphereScattering == true)
{
SGT_ShaderHelper.SetVector(surfaceMaterials, "starPosition", lightSourcePosition);
atmosphereMaterial.SetVector("starPosition", lightSourcePosition);
}
}
if (cloudsMaterials != null)
{
SGT_ShaderHelper.SetVector(cloudsMaterials, "centrePosition", transformPosition);
SGT_ShaderHelper.SetVector(cloudsMaterials, "starDirection", starDirection);
}
if (shadow == true)
{
var shadowMatrix = Matrix4x4.identity;
switch (shadowCasterType)
{
case SGT_ShadowOccluder.Planet:
{
if (shadowCasterGameObject != null)
{
shadowMatrix = SGT_Helper.CalculateSphereShadowMatrix(ShadowCasterRadiusOuter, shadowCasterGameObject.transform.position, lightSourcePosition, transformPosition, uniformScale);
}
}
break;
case SGT_ShadowOccluder.Ring:
{
shadowMatrix = SGT_Helper.CalculateCircleShadowMatrix(ShadowCasterRadiusOuter, transform.position, transform.up, lightSourcePosition, transformPosition, uniformScale);
}
break;
}
SGT_ShaderHelper.SetMatrix(surfaceMaterials, "shadowMatrix", shadowMatrix);
if (atmosphereMaterial != null)
{
atmosphereMaterial.SetMatrix("shadowMatrix", shadowMatrix);
}
if (cloudsMaterials != null)
{
SGT_ShaderHelper.SetMatrix(cloudsMaterials, "shadowMatrix", shadowMatrix);
}
}
// Uncommon shader variables
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.ShadowSettings) == true)
{
var cutoff = ShadowCasterRadiusInner / ShadowCasterRadiusOuter;
var invCutoff = SGT_Helper.Reciprocal(1.0f - cutoff);
var shadowValues = new Vector3(cutoff, invCutoff, 1.0f + ShadowCasterRadiusOuter);
SGT_ShaderHelper.SetVector(surfaceMaterials, "shadowValues", shadowValues);
if (atmosphereMaterial != null)
{
atmosphereMaterial.SetVector("shadowValues", shadowValues);
}
if (cloudsMaterials != null)
{
SGT_ShaderHelper.SetVector(cloudsMaterials, "shadowValues", shadowValues);
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureDay) == true)
{
for (var i = 0; i < surfaceMaterials.Length; i++)
{
surfaceMaterials[i].SetTexture("dayTexture", surfaceTextureDay.GetTexture((CubemapFace)i));
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureNight) == true)
{
for (var i = 0; i < surfaceMaterials.Length; i++)
{
surfaceMaterials[i].SetTexture("nightTexture", surfaceTextureNight.GetTexture((CubemapFace)i));
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureNormal) == true)
{
for (var i = 0; i < surfaceMaterials.Length; i++)
{
surfaceMaterials[i].SetTexture("normalTexture", surfaceTextureNormal.GetTexture((CubemapFace)i));
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureSpecular) == true)
{
for (var i = 0; i < surfaceMaterials.Length; i++)
{
surfaceMaterials[i].SetTexture("specularTexture", surfaceTextureSpecular.GetTexture((CubemapFace)i));
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceSpecularSettings) == true)
{
SGT_ShaderHelper.SetFloat(surfaceMaterials, "specularPower", surfaceSpecularPower * surfaceSpecularPower);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureDetail) == true)
{
SGT_ShaderHelper.SetTexture(surfaceMaterials, "detailTexture", surfaceTextureDetail);
SGT_ShaderHelper.SetFloat(surfaceMaterials, "detailRepeat", surfaceDetailRepeat);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureLighting) == true)
{
SGT_ShaderHelper.SetTexture(surfaceMaterials, "lightingTexture", surfaceLightingTexture);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureShadow) == true)
{
SGT_ShaderHelper.SetTexture(surfaceMaterials, "shadowTexture", shadowTextureSurface);
}
if (atmosphereMaterial != null)
{
SGT_ShaderHelper.SetFloat(surfaceMaterials, "atmosphereRadius", AtmosphereRadius * uniformScale);
SGT_ShaderHelper.SetFloat(surfaceMaterials, "atmosphereFalloff", atmosphereFalloffSurface);
SGT_ShaderHelper.SetFloat(surfaceMaterials, "surfaceRadius", surfaceRadius * uniformScale);
SGT_ShaderHelper.SetFloat(surfaceMaterials, "atmosphereHeight", atmosphereHeight * uniformScale);
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.SurfaceTextureAtmosphere) == true)
{
SGT_ShaderHelper.SetTexture(surfaceMaterials, "atmosphereTexture", atmosphereSurfaceTexture);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.AtmosphereTexture) == true)
{
atmosphereMaterial.SetTexture("atmosphereTexture", atmosphereTexture);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.AtmosphereTextureShadow) == true)
{
atmosphereMaterial.SetTexture("shadowTexture", shadowTextureAtmosphere);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.ScatteringSettings) == true)
{
var mie = -(1.0f - 1.0f / Mathf.Pow(10.0f, atmosphereScatteringMie * 5.0f));
var mie4 = new Vector4(mie * 2.0f, 1.0f - mie * mie, 1.0f + mie * mie, 1.5f);
var ray2 = new Vector2(0.0f, atmosphereScatteringRayleigh);
SGT_ShaderHelper.SetVector(surfaceMaterials, "rayleighValues", ray2);
atmosphereMaterial.SetVector("mieValues", mie4);
atmosphereMaterial.SetVector("rayleighValues", ray2);
}
}
if (cloudsMaterials != null)
{
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.CloudsTextureShadow) == true)
{
SGT_ShaderHelper.SetTexture(cloudsMaterials, "shadowTexture", shadowTextureClouds);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.CloudsTexture) == true)
{
for (var i = 0; i < cloudsMaterials.Length; i++)
{
cloudsMaterials[i].SetTexture("cloudsTexture", cloudsTexture.GetTexture((CubemapFace)i));
}
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.CloudsTextureLighting) == true)
{
SGT_ShaderHelper.SetTexture(cloudsMaterials, "lightingTexture", cloudsLightingTexture);
}
if (SGT_Helper.FlagIsSet(updateShader, ShaderFlags.CloudsFalloffSettings) == true)
{
SGT_ShaderHelper.SetFloat(cloudsMaterials, "falloff", cloudsFalloff * cloudsFalloff);
}
}
updateShader = 0;
}