Raycasting - Physics.ray

Mardok · 12-28-2010 11:42 PM

I test Raycasting and I have strange problem. Please look at screens and check value of COLLIDE variable. It always should be zero(0) because ray nothing hit. I think...

When I turning my Chr 360 deg in some points Rays detect something and variable "collide" is set to 1 but why Rays detect something, since there is nothing there?

All my 6 objects is far away from my Chr.

[Image: 73734044.jpg]

Code:

OrientP &head = cskel.getPoint("Head");

    start = head.pos + Vec(0,1,0);

      end = start + head.dir*3; 

    if(Physics.ray(start, end, &phys_hit)) collide = true; else collide = false; //if ray hit something

[/code]

**Esenthel** · 12-29-2010 01:38 AM

// if ray cuts with any actor on the scene ('groups'=group flag (ACTOR_GROUP) bit combination specifying which groups should be included in testing, use 'IndexToFlag' function)
static Bool ray(C Vec &pos, C Vec &move

move=delta and not target destination

Driklyn · 12-29-2010 06:30 AM

You can draw where the collision is occurring to better visualize what is happening.

Code:

if(Physics.ray(start, end, &phys_hit, ~IndexToFlag(AG_TERRAIN))) { // ignore terrain

    D.dot(RED, phys_hit.plane.pos, 0.003);

    collide = true;

} else {

    collide = false; //if ray hit something

}

Also, to elaborate more on what Esenthel said about 'move' being a delta and not a target, simply remove the "start +" from the 'end' position.

Mardok · 12-29-2010 11:11 AM

(12-29-2010 01:38 AM)Esenthel Wrote: static Bool ray(C Vec &pos, C Vec &move
move=delta and not target destination

Of course...

&move = delta and not target destination

I missed it in a hurry and fatigue wink

When i swapped:

Code:

OrientP &head = cskel.getPoint("Head");

            start = head.pos + Vec(0,1,0);

              end = start + head.dir*5;

if(Physics.ray(start, end, &phys_hit, ~Inde

on

Code:

if(Physics.ray(start, end-start, &phys_hit, ~Inde

It's work correct smile

Sorry for the confusion and thank you for your help.
This thread was helpful also http://www.esenthel.com/community/showth...ht=PhysHit

Mardok · 12-29-2010 10:15 PM

I have yet one little question about Face Index.
Please check this picture, there is " Face: Ind " - and tell me why Ind doesn't show index value of selected face?

[Image: turret.jpg]

Why it is not showing the number of face index, but only " Ind " ?
Can i set Face Index manually? On example: index of all faces is set to 1 ? Is it possible?

I would like use PhysHit::face...

I need this because i need more precision in collision detection.

When I'm testing ground using Rays then PhysHit::face return to me correct values, but if i set Ray on mesh then PhysHit::face is always 0 :(

**Esenthel** · 12-29-2010 10:25 PM

Face:Ind on the image is something else (those are indexes of vertexes)

Quote:PhysHit::face is always 0

which method are you using?
what is the physical body?

Mardok · 12-29-2010 11:19 PM

When I look on car collision is detected okay, but phys_hit.face is 0 why?

Code:

Physics.ray(start, end-start, &phys_hit, ~IndexToFlag(AG_CONTROLLER));

PhysBody:

**Esenthel** · 12-31-2010 03:38 AM

If it's a box then it doesn't have face indexes.

you need to use other method, like detect distance between player and door (for example using Skeleton Point)

Mardok · 01-01-2011 06:22 PM

Thank You for explain.
I did like You said and I'm happy... all works fine ;]

Raycasting - Physics.ray
Author	Message