Finding vector/plane intersection...

I don''t know if the plane intersection is really what you need (I don''t understand your above explaination 100%), but you could check out my homepage tutorial: Plane Collision.

Well, I''ve read through your tutorials...
I''ve also found some others that say approximately the same thing. I guess I don''t understand vectro/matrix/plane math that well. Could you possible give me a ''for instance'' with a triangle and a line?
I have some images to illustrate what I''m getting at...
Typically, someone rendering a tile view in D3D would make a quad by creating 2 triangles as such......


I''ve broken this down a bit more...



I use the vertices in this order...

Vertex 0: (0, 32, 0)...
Vertex 1: (32, 32, 0)...
Vertex 2: (16, 16, 16)...
Vertex 3: (32, 0, 0)...
Vertex 4: (0, 0, 0).

Now, I have (x, y) of (16, 8)... Which is here:


Now, how do I determine the Z-coord of this point when it is in the quad?

Please be detailed, as I''m a bit slow on this subject... Thanks for your help.....

Anyone?

Maybe the full version of this plane algorithm is not needed here.

Have you tried calculating the distance to a point do (1-distance) and multiply with it''s height.
This is not entirely correct, but I''m a little short on time at the moment...

here is asimple method i worked out a while ago with pencil + paper and it works. btw i think plane collision was a bad choice of words

DIST == the distance between the heightmap pts posX+Z == the position of the pt u wanna find the height of

int nx=int( posX / DIST);
int nz=int( posZ / DIST);
float distsquared = DIST*DIST;
int tempx=int(posX)%DIST;
int tempz=int(posZ)%DIST;

float A = ((DIST-(tempx%DIST)) * (DIST-(tempz%DIST))) / distsquared;
float B = ((DIST-(tempx%DIST)) * (tempz%DIST)) / distsquared;
float C = ((tempx%DIST) * (tempz%DIST)) / distsquared;
float D = ((tempx%DIST) * (DIST-(tempz%DIST))) / distsquared;

float groundheight = ((terrainHeight[nx] [nz] *A)
+ (terrainHeight[nx+1][nz] *D)
+ (terrainHeight[nx+1][nz+1]*C)
+ (terrainHeight[nx] [nz+1]*B));
return groundheight;

Thanks guys...

I figured that it was a pretty bad title after I had already posted my question, ut I first thought I would use the collision detection stuff. I tried to edit my message, but I can''t change the title to the post... =\


Thanks for all of your help...