7 replies to this topic

[Ashley Phoenix]

Well, I've looked around the forums of how to keep a gun in a fixed position on a screen and I've found loads of results but none of them are commented or say how to do it.

This is the code I'm using:

d3d_transform_set_identity();
d3d_transform_add_scaling(scale,scale,scale);
d3d_transform_add_rotation_x(x_rot-zdirection);
d3d_transform_add_rotation_y(y_rot);
d3d_transform_add_rotation_z(z_rot+direction);
d3d_transform_add_translation(x,y,z)
draw_set_color(c_white);
d3d_model_draw(gun_upper,+.66,+1.6,+2,upper)
//d3d_model_draw(2,x,y,0,background_get_texture(tex_red))
d3d_transform_set_identity();

Picture 1:

Picture 2:

If you need any more information just ask.

Oh and also, if you point out any code that could be improved, just let me know, thanks

[eafg2]

I think the orgin in the model destroys everything for you,
the model rotates around the orgin and the orgin should be alined with the camera root.

[Ashley Phoenix]

I think the orgin in the model destroys everything for you,
the model rotates around the orgin and the orgin should be alined with the camera root.

Well I've seen it done with other .obj models.

Any idea on how I could fix it.

[eafg2]

With a 3d program like Blender.

[THE_GAME_EDITOR]

You could use gmmodelfix.
Very simple fix by clicking the three x,y and z buttons.
The buttons are called center on mass.

Edited by THE_GAME_EDITOR, 11 March 2012 - 01:48 PM.

[Gamer3D]

It's likely that you have code like this somewhere before you draw your model:

d3d_transform_add_scaling()
d3d_transform_add_rotation()
d3d_transform_add_translation()

To change the local origin of your gun without changing the model itself, use d3d_transform_set_translation() before the rest of the transformations.

[icuurd12b42]

It's likely that you have code like this somewhere before you draw your model:

d3d_transform_add_scaling()
d3d_transform_add_rotation()
d3d_transform_add_translation()

To change the local origin of your gun without changing the model itself, use d3d_transform_set_translation() before the rest of the transformations.

he got scaling.... So I would
d3d_transform_add_translation(0,0,5)
after the scaling and before the rotation.

where 5 would be 5 feet off the ground if 1 unit is a foot.

the gun will follow the rotations and final translation from that position

you have to draw the model with x,y,z set to 0,0,0 though.

The scaling would not be needed if the model had been pre scaled to the game with a 3rd party tool

the d3d_transform_add_translation(0,0,5) would not be needed if you used a 3rd party tool to set the origins to include this first transform. center the model then move it 5 units off the ground.

[TheSnidr]

You could also use a separate, fixed projection for the gun. Some rough pseudo-code:

set_projection(0,0,0, 1,0,0, 0,0,1) //A projection looking down the x-axis
draw_gun() //Draw the gun at its coordinate in the camera's local coordinate system

set_normal_projection()
draw_everything_else()

Game's looking good, and that's a nice weapon model

EDIT:
This is the method I used here (at about 01:50)

Edited by TheSnidr, 11 March 2012 - 10:02 PM.