I have a function made out, but hasn't worked quite well enough for me.
I have the following:
PlayerX/PlayerY
PlayerAngle
LineSegment x1, y1, x2, y2
RayHitX/RayHitY //Where the ray hits the line segment
float calculateBackface(int x1, int y1, int x2, int y2, int camX, int camY){ float vx, vy, vz; if(abs(x1 - x2) < abs(y1 - y2)) { float vx = x2 - x1; float vy = y2 - y1; float vz = 0; }else{ float vx = x1 - x2; float vy = y1 - y2; float vz = 0; } float nx = 0; float ny = 0; float nz = 1.0f; float nXvx = (y1 * nz) - (y2 * vz); //TODO: Always going to be 0 for the second part float nXvy = -((vx * nz) - (vz * nx)); float nXvz = ((vx * ny) - (vy * nx)); //We now have the normalized vector of the line now let's make a plane float A = nXvx; float B = nXvy; float C = nXvz; float D = ((-nXvx * x1) + (-nXvy * y1) + (-nXvz * 0)); //NOW WE HAVE A PLANE //Calculate the Distance of the target point if it is + then it is on the correct side of the wall. //Use the normal vector of n (dot) target point <x, y, 0> float dist = ((nXvx * camX) + (nXvy * camY) + (nXvz * 0)) + D; return dist;}I load in the x's and y's respectively of the line segment x1 y1, x2, y2 and the camX and camY are the pX and pY.
The thing is I don't rotate the walls, I only cast rays from the player and the angle so I'm trying to figure out how I can plug this in to take into account the angle at which the player is facing.
My instinct is to take playerX - line.x1 and playerY - line.y1 and make a vector out of them and plug them into the function's CamX and CamY.
Anyone have any thoughts on this?
EDIT: All right, I was doing some reading and since my Camera is not always at 0,0,0 like a 'normal' 3d engine. I have to find the vector from the pX/pY to a point on the line vector to use as my camera vector. Since the pX/pY Camera will not be at 0, 0, 0.
Thanks.
[Edited by - Jinroh on June 9, 2008 7:01:15 AM]
