Collision within a Radius

Helper

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On 07/04/2011 at 05:24, xxxxxxxx wrote:

Hey Shawn,

What is, if you do more intersections like:

wtail1 =    bd->SW(Vector(x, y, 0));  
wtail2 =    bd->SW(Vector(x+1, y+1, 0));  
wtail3 =    bd->SW(Vector(x+1, y, 0));  
wtail4 =    bd->SW(Vector(x-1, y, 0));

And so one. Use the http://en.wikipedia.org/wiki/Unit_circle for more points and maybe a loop between the circle.

Helper

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On 07/04/2011 at 08:14, xxxxxxxx wrote:

You cold try using PointLineDistance instead. If the distance from the handle to the ray is less than the desired radius, you have a hit.

Helper

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On 07/04/2011 at 09:35, xxxxxxxx wrote:

So if I wanted to use PointLineDistance()...

Would it be like this?

PointLineDistance(wtail, whead, res.hitpos);

Also, is the Vector that is returned by this function the distance fromt the point to the ray?

Helper

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On 07/04/2011 at 09:44, xxxxxxxx wrote:

Or would I instead do:

PointLineDistance(wtail, oray, res.hitpos);

Helper

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On 07/04/2011 at 13:32, xxxxxxxx wrote:

okay using the last code i posted the res.hitpos always returns 0,0,0

Anyone have any idea why?

Helper

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On 07/04/2011 at 14:52, xxxxxxxx wrote:

(0,0,0) is correct.

Because you calculate the distance between your 'intersection line' and a hit point of the intersection.

A Point at a line = distance = 0.

You should do it maybe with points of a polygon near the hit point.

Helper

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On 07/04/2011 at 16:16, xxxxxxxx wrote:

Like this?

Vector distance = PointLineDistance(wtail, oray, pObj->GetMg().off);

Helper

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On 07/04/2011 at 16:25, xxxxxxxx wrote:

How does the vector returned by PointLineDistance() represent the distance,,, what does each Real in the Vector represent?

for example when I use the above line I get a bunch of different numbers and those numbers do not seem to be the same when the camera is in different places..

Hopefully that makes sense.. lol

~Shawn

Helper

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On 07/04/2011 at 16:44, xxxxxxxx wrote:

The ray should be in the same space as the object and the shortest distance is the length of the returned vector.

Helper

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On 07/04/2011 at 17:27, xxxxxxxx wrote:

okay I've got it work using

  
  
Vector distance = PointLineDistance(wtail, whead, pObj->GetMg().off);  
  Real disX = distance.x;  
  Real disY = distance.y;  
  Real disZ = distance.z;  
  
  //if (cRay->GetNearestIntersection(&res))  
  if((disX > -20 && disX < 20) && (disY > -20 && disY < 20) && (disZ > -20 && disZ < 20))    
  {  
      //GePrint("A COLLISION HAS OCCURRED");  
      return TRUE;  
  }

now in order to make this whole thing work the right way I need to be able to capture the initial mouse location when the mouse is clicked and dragged and then not get the mouse location while it is dragging.. So basically I want the mouse location where the user clicks but then I don't want the location while the mouse is dragging.

Is this possible... I currently use BFM_INPUT_X & BFM_INPUT_Y to get the mouse location but this value changes as the mouse is dragging.

Thanks,

Shawn

Helper

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On 07/04/2011 at 18:24, xxxxxxxx wrote:

Just use GetLength(), e.g.

const Real threshold = 10.0;   
Real dist = result.GetLength();   
if(dist <= threshold) return TRUE;

Helper

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On 07/04/2011 at 18:35, xxxxxxxx wrote:

Thank you David that is much cleaner..

  
  Vector distance = PointLineDistance(wtail, whead, pObj->GetMg().off);  
  const Real threshold = 20.0;  
  Real dist = distance.GetLength();  
    
  if(dist <= threshold)    
  {  
      //GePrint("A COLLISION HAS OCCURED");  
      return TRUE;  
  }

Anyone know about getting the mouse position of the initial click when doing a mouse drag?

Thanks,

Shawn

Helper

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On 07/04/2011 at 23:12, xxxxxxxx wrote:

Hello,
a question where you perform this?
if you hare in mouse input you can use ViewPortSelect::PickObject()
this will fill a c4dobjectlist with all obj in the radius in z order.
it will have not very good performance but can solve the situation.

try it

all the best
Franz

Helper

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On 08/04/2011 at 02:50, xxxxxxxx wrote:

Hi Franz. Thanks, I am able to select within a set radius now. See the last code I posted. Now I am trying to figure out how to capture the screen coordinates of the first initial mouse click when the user drags the mouse. I do not want to keep storing the mouse position after that first click so I need to figure out how to store only that first click.

Thanks,

Shawn

Helper

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On 08/04/2011 at 07:40, xxxxxxxx wrote:

This is from the liquid draw example in the SDK.
Seems to work.

Real mx = msg.GetReal(BFM_INPUT_X);  
Real my = msg.GetReal(BFM_INPUT_Y);  
GePrint(RealToString(mx));  
GePrint(RealToString(my));

-ScottA

Helper

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On 08/04/2011 at 08:27, xxxxxxxx wrote:

Howdy,

Originally posted by xxxxxxxx

...Now I am trying to figure out how to capture the screen coordinates of the first initial mouse click when the user drags the mouse. I do not want to keep storing the mouse position after that first click so I need to figure out how to store only that first click....

If you store the mouse x and y in local variables startx and starty, and do that before the while loop, those variables won't change during the dragging.

Adios,
Cactus Dan