3 replies to this topic

[marfin201]

Ok, everyone I have the code like this in create event for obj_player

z = 10;
camdirection = direction;
camzdirection = 0;
zdirection = 0;

draw_set_color(c_white);

d3d_start();
display_mouse_set(display_get_width()/2,display_get_height()/2);

and in step event

camdirection -= (display_get_width()/2-display_mouse_get_x()); 
camzdirection += (display_get_height()/2-display_mouse_get_y());
display_mouse_set(display_get_width()/2,display_get_height()/2);

draw event

distance = 50;
d3d_set_projection (
x-cos(degtorad(camdirection))*cos(degtorad(camzdirection))*distance,
y+sin(degtorad(camdirection))*cos(degtorad(camzdirection))*distance,
z+sin(degtorad(camzdirection))*distance,
x,y,z,
0,0,1);
d3d_transform_add_rotation_z(direction);
d3d_transform_add_translation(x,y,z);
d3d_draw_ellipsoid(10, 10, -10, -10,-10,10, (b_player) ,1,1,20);
d3d_transform_set_identity();

And my question,, is same as my title.
So, can anyone help me ??

EDIT ::
Sorry if my English is bad,,
Ok,, how I can make the object is moving in 3D game,, to front, to back, to right, to left....????

Edited by marfin201, 02 July 2012 - 03:11 AM.

[Tepi]

your topic title, in fact, does not contain a question.

Please post it quick before I close this topic...

[marfin201]

Really ?
Ok, I was wondering about how to make object moving to front, right, back, and left like pacman 3D.....
And that's actually I want to ask about...
Could you help ?? or anyone ??

[Qon]

from your code:

cos(degtorad(camdirection))*cos(degtorad(camzdirection))*distance
-sin(degtorad(camdirection))*cos(degtorad(camzdirection))*distance
-sin(degtorad(camzdirection))*distance

This is the vector you've calculated for the camera direction. Use this as the vector for movement also.

When you say "forward,back,left,right" do you mean the directions in the "ground plane" or the "camera plane"? If it's in the ground plane just leave out *cos(degtorad(camzdirection))
and set the z vector component to 0.

Qam.xt yt zt is the camera forward vector

xr = Qam.yt
yr = -Qam.xt //xr and yr is given by the cross product of the vector (xt,yt,zt) and the vector (0,0,1). It is the vector pointing to the right. zr=0/not used since your up vector is ALWAYS (0,0,1)
QF=cos(dirmod)
QR=sin(dirmod)
x+=(Qam.xt*QF-xr*QR)*movespeed
y+=(Qam.yt*QF-yr*QR)*movespeed
z+=(Qam.zt*QF)*acc //this line will make your camera move up/down when you go forward/backward while looking up/down

not tested as written above, but this is taken from my working engine and I stripped out stuff that is too complex for your case, so it should work fine.