Projecting 3D point to screen?

[Cobradile]

I'm trying to project a 3D point to 2D to have sprites follow a model around in an SDK project based on the 3D demo. However, when I try to apply the code I get online to do so, nothing happens. When I print the values on screen, they're all over the place!

Here's my code.

xpos = cammatrix.xrite * crosshair.transform.xpos + cammatrix.yrite * crosshair.transform.ypos + cammatrix.zrite * crosshair.transform.zpos;

ypos = cammatrix.xdown * crosshair.transform.xpos + cammatrix.ydown * crosshair.transform.ypos + cammatrix.zdown * crosshair.transform.zpos;

screen_x_pos = ((long)xpos + CAMWIDTH) >> 14;
screen_y_pos = ((long)ypos + CAMHEIGHT) >> 14;
buf1_olist[1].bit.xpos = screen_x_pos;
buf2_olist[1].bit.xpos = screen_x_pos;
buf1_olist[1].bit.ypos = screen_y_pos;
buf2_olist[1].bit.ypos = screen_y_pos;
OLbldto(drawbuf ? buf2_olist : buf1_olist, drawbuf ? packed_olist2 : packed_olist1);

(CAMWIDTH is 320, CAMHEIGHT is 240)

I've been told that loadxpt.inc has code to do what I'm looking for. Does anyone here know how to get to that?

What do I do?

Edited August 16 by Cobradile