/// <summary>
/// Updates the shadow transformation and state.
/// </summary>
/// <param name="frustumPlanes">
/// The frustum planes used for culling the shadow.
/// </param>
/// <param name="force">
/// Whether to force the update, even if it is not needed.
/// </param>
/// <returns>
/// The <see cref="RecalculateShadowResult"/> indicating the
/// shadow behaviour change during calculation.
/// </returns>
public RecalculateShadowResult RecalculateShadow(Plane[] frustumPlanes, bool force)
{
#if UNITY_EDITOR
if (_isDestroyed)
{
return(RecalculateShadowResult.Skipped);
}
#endif
_isVisible = _isStatic;
// Determine whether the owner GameObject changed the active state
// and react correspondingly
bool isGameObjectActive = gameObject.activeInHierarchy;
if (isGameObjectActive != _isGameObjectActivePrev)
{
_isGameObjectActivePrev = isGameObjectActive;
if (isGameObjectActive)
{
RegisterShadow();
return(RecalculateShadowResult.ChangedManager);
}
UnregisterShadow();
return(RecalculateShadowResult.ChangedManager);
}
_isGameObjectActivePrev = isGameObjectActive;
if (!isGameObjectActive)
{
return(RecalculateShadowResult.Skipped);
}
// Updating the transform state (position and forward vectors)
// Determine whether the transform has moved
Vector3 transformPosition = _transform.position;
Quaternion transformRotation = _transform.rotation;
Vector3 transformForward = transformRotation * kVector3Forward;
bool transformChanged = false;
if (_autoStaticTime > 0f)
{
if (transformPosition.x != _transformPositionPrev.x ||
transformPosition.y != _transformPositionPrev.y ||
transformPosition.z != _transformPositionPrev.z ||
transformForward.x != _transformForwardPrev.x ||
transformForward.y != _transformForwardPrev.y ||
transformForward.z != _transformForwardPrev.z
)
{
_autoStaticTimeCounter = 0f;
transformChanged = true;
}
_transformPositionPrev = transformPosition;
_transformForwardPrev = transformForward;
}
float deltaTime = Time.deltaTime;
if (!_isFirstCalculation)
{
// If we have AutoStatic
#if UNITY_EDITOR
if (Application.isPlaying)
{
#endif
if (_autoStaticTime > 0f)
{
// If the object has moved - remove the shadow
// from static manager and move to non-static
if (_isStatic && transformChanged)
{
UnregisterShadow();
_isStatic = false;
RegisterShadow();
return(RecalculateShadowResult.ChangedManager);
}
// If the object hasn't moved for AutoStaticTime seconds,
// then mark it as static
_autoStaticTimeCounter += deltaTime;
if (!_isStatic && _autoStaticTimeCounter > _autoStaticTime)
{
UnregisterShadow();
_isStatic = true;
RegisterShadow();
return(RecalculateShadowResult.ChangedManager);
}
}
// Do not update static shadows by default
if (_isStatic && !force)
{
return(RecalculateShadowResult.Skipped);
}
#if UNITY_EDITOR
}
#endif
}
// Is this our first update?
_isFirstCalculation = false;
// Determine the light source position
bool useLightSource = _lightVectorSource == LightVectorSourceEnum.GameObject && _lightSourceObject != null;
Vector3 lightSourcePosition;
if (useLightSource)
{
lightSourcePosition = _lightSourceObject.position;
}
else
{
lightSourcePosition.x = 0f;
lightSourcePosition.y = 0f;
lightSourcePosition.z = 0f;
}
// The actual light direction vector that'll be used
Vector3 actualLightVector;
if (useLightSource)
{
if (_lightSourceObjectIsDirectionalLight)
{
actualLightVector = _lightSourceObject.rotation * kVector3Forward;
}
else
{
actualLightVector.x = transformPosition.x - lightSourcePosition.x;
actualLightVector.y = transformPosition.y - lightSourcePosition.y;
actualLightVector.z = transformPosition.z - lightSourcePosition.z;
actualLightVector = actualLightVector.FastNormalized();
}
}
else
{
actualLightVector = _lightVector;
}
_actualLightVectorPrev = actualLightVector;
// Do a raycast from transform.position to the center of the shadow
RaycastHit hitInfo;
bool raycastResult = Physics.Raycast(transformPosition, actualLightVector, out hitInfo, _projectionDistance, _layerMaskInt);
if (raycastResult)
{
Vector3 hitPoint = hitInfo.point;
// Scale the shadow respectively
Vector3 lossyScale = _transform.lossyScale;
float scaledDoubleShadowSize = Mathf.Max(Mathf.Max(lossyScale.x, lossyScale.y), lossyScale.z) * _shadowSize;
// Distance scale
float distance = hitInfo.distance;
float scaleWeight = (distance - _shadowSizeScaleStartDistance) / (_shadowSizeScaleEndDistance - _shadowSizeScaleStartDistance);
scaleWeight = scaleWeight > 1f ? 1f : (scaleWeight < 0f ? 0f : scaleWeight);
if (scaleWeight != 0f)
{
float scale = _shadowSizeEndScale + (1f - _shadowSizeEndScale) * (1f - scaleWeight);
scaledDoubleShadowSize *= scale;
}
float scaledShadowSize = scaledDoubleShadowSize * 0.5f;
if (!_isStatic && _cullInvisible)
{
// We can calculate approximate bounds for orthographic shadows easily
// and cull shadows based on these bounds and camera frustum
if (!_isPerspectiveProjection)
{
Vector3 shadowScale;
shadowScale.x = scaledShadowSize;
shadowScale.y = scaledShadowSize;
shadowScale.z = scaledShadowSize;
Bounds bounds = new Bounds();
bounds.center = hitPoint;
bounds.extents = shadowScale;
_isVisible = GeometryUtility.TestPlanesAABB(frustumPlanes, bounds);
if (!_isVisible)
{
return(RecalculateShadowResult.Skipped);
}
}
else
{
// For perspective shadows, we can at least try to
// not draw shadows that fall on invisible objects
Bounds rendererBounds;
bool result = ShadowManager.Instance.ColliderToRendererBoundsCache.GetRendererBoundsFromCollider(hitInfo.collider, out rendererBounds);
if (result)
{
_isVisible = GeometryUtility.TestPlanesAABB(frustumPlanes, rendererBounds);
if (!_isVisible)
{
return(RecalculateShadowResult.Skipped);
}
}
}
}
// Calculate angle from light direction vector to surface normal
if (_isSmoothRotation)
{
_normal = Vector3.Lerp(_normal, hitInfo.normal, _smoothRotationSpeed * deltaTime).FastNormalized();
}
else
{
_normal = hitInfo.normal;
}
float lightVectorToNormalDot = -actualLightVector.x * _normal.x - actualLightVector.y * _normal.y - actualLightVector.z * _normal.z;
float angleToNormal = FastMath.FastPseudoAcos(lightVectorToNormalDot) * Mathf.Rad2Deg;
if (angleToNormal > _angleFadeMax)
{
// Skip shadows that fall with extreme angles
_isVisible = false;
return(RecalculateShadowResult.Skipped);
}
// Determine the forward direction of shadow base quad
Vector3 forward;
float dot = transformForward.x * actualLightVector.x + transformForward.y * actualLightVector.y + transformForward.z * actualLightVector.z;
if (Mathf.Abs(dot) < 1f - Vector3.kEpsilon)
{
forward.x = transformForward.x - dot * actualLightVector.x;
forward.y = transformForward.y - dot * actualLightVector.y;
forward.z = transformForward.z - dot * actualLightVector.z;
forward = forward.FastNormalized();
}
else
{
// If the forward direction matches the light direction vector somehow
Vector3 transformUp = transformRotation * kVector3Up;
dot = transformUp.x * actualLightVector.x + transformUp.y * actualLightVector.y + transformUp.z * actualLightVector.z;
forward.x = transformUp.x - dot * actualLightVector.x;
forward.y = transformUp.y - dot * actualLightVector.y;
forward.z = transformUp.z - dot * actualLightVector.z;
forward = forward.FastNormalized();
}
// Rotation of shadow base quad
Vector3 actualLightVectorNegated;
actualLightVectorNegated.x = -actualLightVector.x;
actualLightVectorNegated.y = -actualLightVector.y;
actualLightVectorNegated.z = -actualLightVector.z;
Quaternion rotation = Quaternion.LookRotation(forward, actualLightVectorNegated);
// Optimized version of
// Vector3 right = rotation * Vector3.right;
float num2 = rotation.y * 2f;
float num3 = rotation.z * 2f;
float num5 = rotation.y * num2;
float num6 = rotation.z * num3;
float num7 = rotation.x * num2;
float num8 = rotation.x * num3;
float num11 = rotation.w * num2;
float num12 = rotation.w * num3;
Vector3 right;
right.x = 1f - (num5 + num6);
right.y = num7 + num12;
right.z = num8 - num11;
// Base vertices calculation
float aspectRatioRec = 1f / _aspectRatio;
Vector3 tmp1;
tmp1.x = forward.x * scaledShadowSize;
tmp1.y = forward.y * scaledShadowSize;
tmp1.z = forward.z * scaledShadowSize;
Vector3 tmp2;
tmp2.x = right.x * aspectRatioRec * scaledShadowSize;
tmp2.y = right.y * aspectRatioRec * scaledShadowSize;
tmp2.z = right.z * aspectRatioRec * scaledShadowSize;
Vector3 diff;
diff.x = tmp1.x - tmp2.x;
diff.y = tmp1.y - tmp2.y;
diff.z = tmp1.z - tmp2.z;
Vector3 sum;
sum.x = tmp1.x + tmp2.x;
sum.y = tmp1.y + tmp2.y;
sum.z = tmp1.z + tmp2.z;
Vector3 baseVertex;
baseVertex.x = transformPosition.x - sum.x;
baseVertex.y = transformPosition.y - sum.y;
baseVertex.z = transformPosition.z - sum.z;
_baseVertices[0] = baseVertex;
baseVertex.x = transformPosition.x + diff.x;
baseVertex.y = transformPosition.y + diff.y;
baseVertex.z = transformPosition.z + diff.z;
_baseVertices[1] = baseVertex;
baseVertex.x = transformPosition.x + sum.x;
baseVertex.y = transformPosition.y + sum.y;
baseVertex.z = transformPosition.z + sum.z;
_baseVertices[2] = baseVertex;
baseVertex.x = transformPosition.x - diff.x;
baseVertex.y = transformPosition.y - diff.y;
baseVertex.z = transformPosition.z - diff.z;
_baseVertices[3] = baseVertex;
// Calculate a plane from normal and position
Vector3 offsetPoint;
offsetPoint.x = hitPoint.x + _normal.x * _shadowOffset;
offsetPoint.y = hitPoint.y + _normal.y * _shadowOffset;
offsetPoint.z = hitPoint.z + _normal.z * _shadowOffset;
FastMath.Plane shadowPlane = new FastMath.Plane(_normal, offsetPoint);
float distanceToPlane;
FastMath.Ray ray = new FastMath.Ray();
// Calculate the shadow vertices
if (_isPerspectiveProjection && useLightSource)
{
ray.Direction.x = lightSourcePosition.x - _baseVertices[0].x;
ray.Direction.y = lightSourcePosition.y - _baseVertices[0].y;
ray.Direction.z = lightSourcePosition.z - _baseVertices[0].z;
ray.Origin = _baseVertices[0];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[0].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[0].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[0].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Direction.x = lightSourcePosition.x - _baseVertices[1].x;
ray.Direction.y = lightSourcePosition.y - _baseVertices[1].y;
ray.Direction.z = lightSourcePosition.z - _baseVertices[1].z;
ray.Origin = _baseVertices[1];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[1].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[1].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[1].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Direction.x = lightSourcePosition.x - _baseVertices[2].x;
ray.Direction.y = lightSourcePosition.y - _baseVertices[2].y;
ray.Direction.z = lightSourcePosition.z - _baseVertices[2].z;
ray.Origin = _baseVertices[2];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[2].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[2].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[2].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Direction.x = lightSourcePosition.x - _baseVertices[3].x;
ray.Direction.y = lightSourcePosition.y - _baseVertices[3].y;
ray.Direction.z = lightSourcePosition.z - _baseVertices[3].z;
ray.Origin = _baseVertices[3];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[3].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[3].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[3].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
}
else
{
ray.Direction = actualLightVector;
ray.Origin = _baseVertices[0];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[0].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[0].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[0].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Origin = _baseVertices[1];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[1].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[1].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[1].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Origin = _baseVertices[2];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[2].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[2].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[2].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
ray.Origin = _baseVertices[3];
shadowPlane.Raycast(ref ray, out distanceToPlane);
_shadowVertices[3].x = ray.Origin.x + ray.Direction.x * distanceToPlane;
_shadowVertices[3].y = ray.Origin.y + ray.Direction.y * distanceToPlane;
_shadowVertices[3].z = ray.Origin.z + ray.Direction.z * distanceToPlane;
}
// Calculate the shadow alpha
float shadowAlpha = _initialAlpha;
// Alpha base on distance to the surface
if (distance > _fadeDistance)
{
shadowAlpha = shadowAlpha - (distance - _fadeDistance) / (_projectionDistance - _fadeDistance) * shadowAlpha;
}
// Alpha based on shadow fall angle
if (angleToNormal > _angleFadeMin)
{
shadowAlpha = shadowAlpha - (angleToNormal - _angleFadeMin) / (_angleFadeMax - _angleFadeMin) * shadowAlpha;
}
// Convert float alpha to byte
//_color.a = shadowAlpha;
_color32.a = (byte)(shadowAlpha * 255f);
_isVisible = true;
}
return(RecalculateShadowResult.Recalculated);
}
