std::list<Ogre::Vector2> WindManager::subdivideCurrent(Ogre::Vector2 origin, Ogre::Vector2 current)
{
// The list for storing the subdivided vector
std::list<Ogre::Vector2> subdivideList;
Ogre::Vector2 subVector;
// While the wind current vector is too long
while(current.length() > this->mWorld->getWindMap()->getAlphaVector().length())
{
// Calculate the subvector to the size of the alpha vector
subVector = current.normalisedCopy() * this->mWorld->getWindMap()->getAlphaVector().length();
// Move the origin forward to the end of the next subvector
origin += subVector;
// Store the found subvector in the subdivision list
subdivideList.push_back(origin);
// Cut off the subVector
current -= subVector;
}
// Add the final point of the wind current
subdivideList.push_back(origin + current);
// Return the subdivided wind current vector
return subdivideList;
}
void WindManager::addPoint(Ogre::Vector2& newPosition)
{
// Sanitize the point to world border if it's out of bounds.
if (newPosition.x > mWorld->getWorldBounds().x - mWorld->getWindMap()->getOffset().x) {
newPosition.x = mWorld->getWorldBounds().x - mWorld->getWindMap()->getOffset().x;
} if (newPosition.x < mWorld->getWindMap()->getOffset().x - mWorld->getWorldBounds().x) {
newPosition.x = mWorld->getWindMap()->getOffset().x - mWorld->getWorldBounds().x;
} if (newPosition.y > mWorld->getWorldBounds().y - mWorld->getWindMap()->getOffset().y) {
newPosition.y = mWorld->getWorldBounds().y - mWorld->getWindMap()->getOffset().y;
} if(newPosition.y < mWorld->getWindMap()->getOffset().y - mWorld->getWorldBounds().y) {
newPosition.y = mWorld->getWindMap()->getOffset().y - mWorld->getWorldBounds().y;
}
// If we've already started creating the wind current
if(mCurrentPosition != Ogre::Vector2::ZERO)
{
// Calculate the delta between the new position and the previous position
Ogre::Vector2 deltaVector = newPosition - mCurrentPosition;
// Only add the new position if the delta isn't zero
if(deltaVector.length() > mEssentiallyZero.length())
{
// Create the arrow facing in the direction of the created current
createArrow(mCurrentPosition, deltaVector, ArrowType::RED);
// Add the new point to the wind current
this->mWindCurrent->addPoint(mCurrentPosition, deltaVector);
} else {
return;
}
}
// Update the current position, because we're dynamic
mCurrentPosition = newPosition;
}
Ogre::Vector2 Mesh::getGridPosition(const Ogre::Vector2 &Position)
{
if (mOptions.MeshSize.Width == 0 && mOptions.MeshSize.Height == 0)
{
return Position;
}
if (!isPointInGrid(Position))
{
return Ogre::Vector2(-1,-1);
}
Ogre::AxisAlignedBox WordMeshBox = mEntity->getWorldBoundingBox();
// Get our mesh grid rectangle: (Only a,b,c corners)
// c
// |
// |
// |
// a-----------b
Ogre::Vector3
a = WordMeshBox.getCorner(Ogre::AxisAlignedBox::FAR_LEFT_BOTTOM),
b = WordMeshBox.getCorner(Ogre::AxisAlignedBox::FAR_RIGHT_BOTTOM),
c = WordMeshBox.getCorner(Ogre::AxisAlignedBox::NEAR_LEFT_BOTTOM);
// Transform all corners to Ogre::Vector2 array
Ogre::Vector2 Corners2D[3] =
{Ogre::Vector2(a.x, a.z),
Ogre::Vector2(b.x, b.z),
Ogre::Vector2(c.x, c.z)};
// Get segments AB and AC
Ogre::Vector2 AB = Corners2D[1]-Corners2D[0],
AC = Corners2D[2]-Corners2D[0];
// Find the X/Y position projecting the Position point to AB and AC segments.
Ogre::Vector2 XProjectedPoint = Position-AC,
YProjectedPoint = Position-AB;
// Fint the intersections points
Ogre::Vector2 XPoint = Math::intersectionOfTwoLines(Corners2D[0],Corners2D[1],Position,XProjectedPoint),
YPoint = Math::intersectionOfTwoLines(Corners2D[0],Corners2D[2],Position,YProjectedPoint);
// Find lengths
Ogre::Real ABLength = AB.length(),
ACLength = AC.length(),
XLength = (XPoint-Corners2D[0]).length(),
YLength = (YPoint-Corners2D[0]).length();
// Find final x/y grid positions in [0,1] range
Ogre::Real XFinal = XLength / ABLength,
YFinal = YLength / ACLength;
return Ogre::Vector2(XFinal,YFinal);
}
void GodRaysManager::_updateRays()
{
// Get frustum corners to calculate far plane dimensions
const Ogre::Vector3 *FrustumCorners = mProjectorCamera->getWorldSpaceCorners();
// Calcule far plane dimensions
float FarWidth = (FrustumCorners[4] - FrustumCorners[5]).length();
Ogre::Real RaysLength = mProjectorCamera->getFarClipDistance();
mManualGodRays->beginUpdate(0);
Ogre::Vector2 Pos;
Ogre::Real Dis, RayLength;
// Rays are modeled as piramids, 12 vertex each ray
//
// // 0\\
// /| | |
// || | |
// || | | (0,0) (1,0)
// || | | A B
// || | |
// |A----|-|B (0,1) (1,1)
// |/ |/ C D
// C------D
for(int k = 0; k < mNumberOfRays; k++)
{
Pos = _calculateRayPosition(k);
Dis = mRaysSize*RaysLength;
RayLength = RaysLength*(0.95+Pos.length());
Pos *= FarWidth/2;
// 4 Planes, 3 vertices each plane, 12 vertices per ray
// ----> 1/4
// 0
mManualGodRays->position(0, 0, 0);
// A
mManualGodRays->position(Pos.x, Pos.y, -RayLength);
// B
mManualGodRays->position(Pos.x+Dis, Pos.y, -RayLength);
// ----> 2/4
// 0
mManualGodRays->position(0, 0, 0);
// D
mManualGodRays->position(Pos.x+Dis, Pos.y+Dis, -RayLength);
// B
mManualGodRays->position(Pos.x+Dis, Pos.y, -RayLength);
// ----> 3/4
// 0
mManualGodRays->position(0, 0, 0);
// C
mManualGodRays->position(Pos.x, Pos.y+Dis, -RayLength);
// D
mManualGodRays->position(Pos.x+Dis, Pos.y+Dis, -RayLength);
// ----> 4/4
// 0
mManualGodRays->position(0, 0, 0);
// C
mManualGodRays->position(Pos.x, Pos.y+Dis, -RayLength);
// A
mManualGodRays->position(Pos.x, Pos.y, -RayLength);
}
mManualGodRays->end();
}
