Re: [Quake-C] Roll Angle

[<qu...@ca...>]

On 2016-08-22 12:38, Cobalt wrote:
> Trying to figure out the roll value on an ent that I am basicly 
> sticking to
> a wall, in this case its a gib. The code works pretty well,


I gather what you want is the appearance of the gib "rolling" down the 
wall.

I know if you want to rotate around the Z axis, you set avelocity_y...
So what you likely want is some combination of _x or _z and the model 
facing.


You might also want:

MOVETYPE_TOSS			= 6;	// gravity

Dont gibs already have that set?


>       self.avelocity = (vectoangles (trace_plane_normal) + self.size) *
> 0.05;  // This is the main calc

Does this do what you want?


>       self.velocity_z = vlen (self.size) * -1.125;  // Downward 
> depending on
> overall size


This would move something in a negative z direction.  Not sure about 
using size to calculate the vector.

What about walls that shift away from a 90 degree vertical plane?
(This is the same issue as the corner problem.)

makevectors(trace_plane_normal);

v_up should now point vertically up along the face of the wall.
Negate that for a velocity_z.



> self.avelocity = (random()) * (vectoangles (self.size) + vectoangles
> (self.velocity));


This will impart some random rotational velocity.


> Im only grabbing trace_plane_normal once in the gibs touch field, as
> Darkplaces accurately populates that field
> in any .touch usually very accurately, but I think perhaps I would need 
> to
> do a traceline continually as the gib falls

You indeed must call traceline to populate the normal field.

> in its think because its possible the surface of the wall may change as 
> well
> as it reaching a corner, in which case we can either
> make it fall to the floor or just hang there and bleed for a while.


Some version of this "should" work:

self.angles = vectoangles(trace_plane_normal); // face the normal - note 
this will "jump" if not close to this facing
self.avelocity_z = 30; // or your size / velo based calculation -- 
negate if it rolls the wrong way

if that isnt it try self.avelocity_x.

You may also want to try setting angles to v_right
(you need makevectors(trace_plane_normal); to get them.)




Another thing to _possibly_ look into (it gets implemented in the HD 
pack) is the gyro
physics package.

http://www.quakewiki.net/quake-1/mods/gyro/

http://quakeone.com/forums/quake-mod-releases/finished-works/6076-small-mod-compilation.html

> Added adjustable Gyro physics: Monsters, gibs and backpacks interact 
> with liquids and weapon projectiles

Whether that will do what you want, I cant say.
Nor how it gets implemented.

You could install and load the small mod.
I know one feature is "kicking" gibs, by walking on them.
You could make some gibs, kick them around and see what they do near 
walls.