/*
* Handles the creation of the terrain. Including determining the terrain shape, creating meshes and applying collision points
*/
public void GenerateMap(Square connectingSquare)
{
boundary = new Square[width];
if (connectingSquare == null)
{
HeightGenerator(lowestPoint = 20);
connectingSquare = boundary[0];
}
else
{
xOffset = connectingSquare.x + 1;
HeightGenerator(lowestPoint = connectingSquare.y);
}
Smoother();
MeshGenerator meshGen = GetComponent <MeshGenerator>();
meshGen.GenerateMesh(boundary, lowestPoint, connectingSquare);
SectionCollider addCollider = GetComponent <SectionCollider>();
addCollider.addCollider();
}
//Generates the mesh for the terrain
public void GenerateMesh(Square[] boundary, int lowestPoint, Square connectingSquare)
{
AssignNodes(boundary);
/* Runs through all boundary squares in the section of the map
*
* It is reponsible for assigning the meshes to these squares and linking them together smoothly with curved meshes.
*
* Comments are shown above each if statement explaining the current square it is looking at and how it uses the squares around it to determine how to link the squares smoothly.
*
* P = Previous Square
* x = Current Square
* N = Next Square
* S = Next Next Square
*/
for (int x = 0; x < boundary.Length - 2; x++)
{
Square previousSquare;
if (x == 0)
{
previousSquare = connectingSquare;
//connectingSquare.topLeft.position.x = -1; //topleft is the only node accessed that belongs to the previous section with its x value being the last value before the section ends. Setting it to -1 fixes any issues that occur with collision points
}
else
{
previousSquare = boundary[x - 1];
}
Square nextSquare = boundary[x + 1];
Square nextNextSquare = boundary[x + 2];
if (nextSquare != null && nextNextSquare != null)
{
SectionCollider sectionCollider = GetComponent <SectionCollider>();
Vector2[] collisionPoints;
/* _
* _|N|
* |x|^
*
* When the elevation is going up
*/
if (nextSquare.y > boundary[x].y)
{
AssignSquareMesh(boundary[x]); //Creates the mesh for the current square
/* _
* _|S|
* _|N|^
* |x|
* When the elevation will still be going up for the next 2 squares
*/
if (nextNextSquare.y > nextSquare.y)
{
/* _
* _|S|
* _|N|
* _|x| -- You are here (x)
* |P|
* Is currently going up a hill (Previous squares was lower and next squares are higher than the current square)
* Will create a straight diagonal line from the current square (x) to the next square (N)
*
*/
if (previousSquare.y < boundary[x].y)
{
AssignTriangleMesh(boundary[x].topLeft.position, nextSquare.topLeft.position, boundary[x].topRight.position);
collisionPoints = new Vector2[2] {
boundary[x].topLeft.position, nextSquare.topLeft.position
};
}
/*This statement contains two different possible scenarios and creates the mesh accordingly.
*
* First Scenario uses the previous square from 2 squares back to determine what curve is needed
* _
* _|S|
* _ _|N|
* _|P||x|
* |2|
*
* At a point in a hill that is slightly flat.
* Will create a steep curve to smooth the transition between the curve from the previous square (P) to the next square (N)
*
* Second Scenario:
* _
* _|S|
* _ _|N|
* |P||x| -- You are here (x)
*
* At the bottom of a hill starting to go up (First square to change elevation from flat terrain)
* Will curve the mesh from the start of the previous square (P) to the end of the current square (x).
*/
else
{
Square x2PreviousSquare;
if (x < 2)
{
x2PreviousSquare = previousSquare;
}
else
{
x2PreviousSquare = boundary[x - 2];
}
if (x2PreviousSquare.y < previousSquare.y)
{
collisionPoints = calculateQuadraticCurve(boundary[x].topLeft, new Vector2(boundary[x].topLeft.position.x + 0.15f, boundary[x].topLeft.position.y), nextSquare.topLeft);
AssignCurveVertices(collisionPoints, boundary[x].topRight.position);
}
else
{
collisionPoints = calculateQuadraticCurve(previousSquare.topLeft, new Vector2(previousSquare.topLeft.position.x + 1, nextSquare.y), nextSquare.topLeft);
AssignCurveVertices(collisionPoints, nextSquare.bottomLeft.position);
}
}
}
/* _ _
* _|N||S|
* |x|^
* When the elevation will only be going up for the next square
*/
else
{
/* _ _
* _|N||S|
* _|x| -- You are here (x)
* |P|
*
* Is at the end of a hill (Previous square was lower but the next square goes back to flat terrain)
* Will curve the mesh from the current square (x) to the end of the next square (N)
*/
if (previousSquare.y < boundary[x].y)
{
collisionPoints = calculateQuadraticCurve(boundary[x].topLeft, new Vector2(nextSquare.topLeft.position.x - 0.25f, nextSquare.topLeft.position.y), nextSquare.topRight);
AssignCurveVertices(collisionPoints, nextSquare.bottomRight.position);
AssignSquareMesh(boundary[x].bottomLeft.position, boundary[x].bottomRight.position, new Vector2(boundary[x].x, 0), new Vector2(boundary[x].bottomRight.position.x, 0));
x++; //Skip over next boundary square as mesh has already been drawn for it
}
/*
* When a small elevation change occurs that doesn't match the other criteria (Normally occurs if elevation changes by 1 square but rest is flat terrain)
*
* Example:
* _ _
* _ _|N||S|
* |P||x| -- You are here(x)
*
* Will curve the mesh from the start of the current square (x) to the end of the next square (N)
*/
else
{
collisionPoints = calculateCubicCurve(boundary[x].topLeft, new Vector2(boundary[x].topLeft.position.x + 1, boundary[x].topRight.position.y), new Vector2(nextSquare.topRight.position.x - 1, nextSquare.topRight.position.y), nextSquare.topRight);
AssignCurveVertices(collisionPoints, nextSquare.bottomRight.position);
AssignSquareMesh(boundary[x].bottomLeft.position, boundary[x].bottomRight.position, new Vector2(boundary[x].x, 0), new Vector2(boundary[x].bottomRight.position.x, 0));
x++;
}
}
sectionCollider.addPoint(collisionPoints);
}
/* _
* |x|_
* >|N|
*
* When the elevation is going down
*/
else if (nextSquare.y < boundary[x].y)
{
/* _
* |x|_
* |N|_
* >|S|
* When the elevation will still be going down for the next 2 squares
*/
if (nextNextSquare.y < nextSquare.y)
{
/* _
* |P|_
* |x|_
* |N|_
* |S|
* Is currently going down a hill (Previous squares was higher and next squares are lower than the current square)
* Will create a straight diagonal line from the current square (x) to the next square (N)
*
*/
if (previousSquare.y > boundary[x].y)
{
AssignSquareMesh(boundary[x]);
AssignTriangleMesh(boundary[x].topRight.position, nextSquare.topRight.position, boundary[x].bottomRight.position);
collisionPoints = new Vector2[2] {
boundary[x].topRight.position, nextSquare.topRight.position
};
}
/* _ _
* |P||x|_
* |N|_
* |S|
*
* At the top of a hill starting to go down (First square to change elevation from flat terrain)
* Will curve the mesh from the start of the current square (x) to the end of the next square (N).
*/
else
{
collisionPoints = calculateQuadraticCurve(boundary[x].topLeft, new Vector2(boundary[x].topRight.position.x, boundary[x].topLeft.position.y), nextSquare.topRight);
AssignCurveVertices(collisionPoints, boundary[x].bottomLeft.position);
}
}
/* _
* |x|_ _
* >|N||S|
*
* When the elevation will only be going down for the next square
*/
else
{
/*This statement contains two different possible scenarios and creates the mesh accordingly.
*
* First scenario uses a square 3 steps forward to determine the curve
* _
* |P|_
* |x|_ _
* |N||S|_
* |3|
*
* There is a flat point in the hill
* Will curve the mesh between the current square (x) and the end of the next square (S)
*
* Second Scenario:
* _
* |P|_
* |x|_ _
* |N||S|
*
* Is at the end of a hill (Previous square was higher but the next square goes back to flat terrain)
* Will curve the mesh from the end of current square (x) to the end of the next next square (S)
*/
if (previousSquare.y > boundary[x].y)
{
AssignSquareMesh(boundary[x]);
Square x3NextSquare;
if (x > boundary.Length - 3)
{
x3NextSquare = nextNextSquare;
}
else
{
x3NextSquare = boundary[x + 3];
}
if (x3NextSquare.y < nextNextSquare.y)
{
collisionPoints = calculateQuadraticCurve(boundary[x].topRight, new Vector2(nextSquare.topRight.position.x - 0.2f, nextSquare.topRight.position.y), nextSquare.topRight);
AssignCurveVertices(collisionPoints, nextSquare.topLeft.position);
}
else
{
collisionPoints = calculateQuadraticCurve(boundary[x].topRight, new Vector2(nextSquare.topRight.position.x - 0.25f, nextSquare.topRight.position.y), nextNextSquare.topRight);
AssignCurveVertices(collisionPoints, boundary[x].bottomRight.position);
}
}
/*
* When a small elevation change occurs that doesn't match the other criteria (Normally occurs if elevation changes by 1 square but rest is flat terrain)
*
* Example:
* _ _
* |P||x|_ _
* |N||S|
* Will curve the mesh from the start of the current square (x) to the end of the next square (N)
*/
else
{
AssignSquareMesh(boundary[x + 1]);
collisionPoints = calculateCubicCurve(boundary[x].topLeft, new Vector2(boundary[x].topLeft.position.x + 1, boundary[x].topLeft.position.y), new Vector2(nextSquare.topLeft.position.x, nextSquare.topLeft.position.y), nextSquare.topRight);
AssignCurveVertices(collisionPoints, boundary[x].bottomLeft.position);
AssignSquareMesh(boundary[x].bottomLeft.position, boundary[x].bottomRight.position, new Vector2(boundary[x].x, 0), new Vector2(boundary[x].bottomRight.position.x, 0));
x++;
}
}
sectionCollider.addPoint(collisionPoints);
}
/*
* When the elevation remains the same for the next square
* _ _
* ...|x||N|...
*/
else if (nextSquare.y == boundary[x].y)
{
AssignSquareMesh(boundary[x]);
sectionCollider.addPoint(boundary[x].topRight.position);
}
AssignSquareMesh(boundary[x].bottomLeft.position, boundary[x].bottomRight.position, new Vector2(boundary[x].x, 0), new Vector2(boundary[x].bottomRight.position.x, 0));
}
}
//Add the last two squares to the section as the nextSquare variables don't apply to these last squares
for (int i = boundary.Length - 2; i < boundary.Length; i++)
{
AssignSquareMesh(boundary[i]);
AssignSquareMesh(boundary[i].bottomLeft.position, boundary[i].bottomRight.position, new Vector2(boundary[i].x, 0), new Vector2(boundary[i].bottomRight.position.x, 0));
GetComponent <SectionCollider>().addPoint(boundary[i].topRight.position);
}
mesh = new Mesh();
GetComponent <MeshFilter>().mesh = mesh;
mesh.vertices = vertices.ToArray(); //Assigns the vertices and triangles to the mesh to be generated
mesh.triangles = triangles.ToArray();
mesh.RecalculateNormals();
}
