Vector3Int FindRaycastSquare(RaycastHit hit)
{
Vector3 point = hit.point;
// Remember that chessboard coordiantes are permutation of Unity coordinates.
ChessBoardProperties props = chessBoard.properties; // New, SRP compliant.
Vector2 boardXedges = props.boardXedges;
Vector2 boardYedges = props.boardYedges;
Vector2 boardZedges = props.boardZedges;
Vector3Int size = props.size;
float squareThickness = props.squareThickness;
int boardVerticalSep = props.boardVerticalSep;
if (debug)
{
print("boardXedges = " + boardXedges);
print("boardYedges = " + boardYedges);
print("boardZedges = " + boardZedges);
print("size = " + size);
print("squareThickness = " + squareThickness);
print("boardVerticalSep = " + boardVerticalSep);
print("----------");
}
bool withinX = boardXedges[0] < point.z && point.z < boardXedges[1];
bool withinY = boardYedges[0] < point.x && point.x < boardYedges[1];
bool withinZ = boardZedges[0] < point.y && point.y < boardZedges[1] + squareThickness;
if (!(withinX && withinY && withinZ))
{
print("*** nullSquare ***");
return(nullSquare);
}
int zCoord = 0;
int xCoord = 0;
int yCoord = 0;
// Find level (horizontal).
for (int k = 0; k < size.z; k++)
{
float loZ = boardZedges[0] + k * boardVerticalSep;
float hiZ = boardZedges[0] + (k + 1 - squareThickness) * boardVerticalSep;
withinZ = loZ < point.y && point.y < hiZ;
if (withinZ)
{
zCoord = k;
break;
}
}
if (!withinZ)
{
return(nullSquare);
}
// Find left vertical.
for (int i = 0; i < size.x; i++)
{
withinX = boardXedges[0] + i < point.z && point.z < boardXedges[0] + i + 1;
if (withinX)
{
xCoord = i;
break;
}
}
// Find right vertical.
for (int j = 0; j < size.y; j++)
{
withinY = boardYedges[0] + j < point.x && point.x < boardYedges[0] + j + 1;
if (withinY)
{
yCoord = j;
break;
}
}
return(new Vector3Int(xCoord, yCoord, zCoord));
}
