Collision with polytopes (II).

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Francesc Blanes Kirchner (cesc++at++matrust.es)
Wed, 20 Oct 1999 09:29:11 +0100

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Hello all,

I' ve been making more tests and I think I don't understand how
polytopes works concerning intersections.

I made two test, as you can see below, with results that are very
strange for me.

Is there anybody that can explain me what I'm doing wrong?
How can I test for collision between two objects (not between boundary
boxes).

Running Performer 2.2 on a Onyx RE2 with IRIX 6.2

Thanks again!!

********** TEST 1 **********************
===========================================
ptope1 (should be a cube)
===========================================
pfPolytope: 0x1807acd0 6 facets
_facets[0]
pfPlane: normal 1.000000 0.000000 0.000000
offset 1.000000
_facets[1]
pfPlane: normal 0.000000 1.000000 0.000000
offset 1.000000
_facets[2]
pfPlane: normal 0.000000 0.000000 1.000000
offset 1.000000
_facets[3]
pfPlane: normal -1.000000 0.000000 0.000000
offset 1.000000
_facets[4]
pfPlane: normal 0.000000 -1.000000 0.000000
offset 1.000000
_facets[5]
pfPlane: normal 0.000000 0.000000 -1.000000
offset 1.000000
===========================================
ptope2 (should be 3 planes)
===========================================
pfPolytope: 0x1807ad00 3 facets
_facets[0]
pfPlane: normal 1.000000 0.000000 0.000000
offset 2.000000
_facets[1]
pfPlane: normal 0.000000 1.000000 0.000000
offset 2.000000
_facets[2]
pfPlane: normal 0.000000 0.000000 1.000000
offset 2.000000

pfPtopeContainsPtope(ptope2,ptope1) is 3 (I expected 7)
pfPtopeContainsPtope(ptope1,ptope2) is 3

********** TEST 2 **********************
===========================================
ptope1 (should be a cube)
===========================================
pfPolytope: 0x1807acd0 6 facets
_facets[0]
pfPlane: normal 1.000000 0.000000 0.000000
offset 1.000000
_facets[1]
pfPlane: normal 0.000000 1.000000 0.000000
offset 1.000000
_facets[2]
pfPlane: normal 0.000000 0.000000 1.000000
offset 1.000000
_facets[3]
pfPlane: normal -1.000000 0.000000 0.000000
offset 1.000000
_facets[4]
pfPlane: normal 0.000000 -1.000000 0.000000
offset 1.000000
_facets[5]
pfPlane: normal 0.000000 0.000000 -1.000000
offset 1.000000
===========================================
ptope2 (should be 4 planes, on more than in test1)
===========================================
pfPolytope: 0x1807ad00 4 facets
_facets[0]
pfPlane: normal 1.000000 0.000000 0.000000
offset 2.000000
_facets[1]
pfPlane: normal 0.000000 1.000000 0.000000
offset 2.000000
_facets[2]
pfPlane: normal 0.000000 0.000000 1.000000
offset 2.000000
_facets[3] <--- NEW
pfPlane: normal -1.000000 0.000000 0.000000
offset 2.000000

pfPtopeContainsPtope(ptope2,ptope1) is 0 (I expected 7)
pfPtopeContainsPtope(ptope1,ptope2) is 3

--
+----------------------------------------------------------------------+
|   Francesc Blanes Kirchner          Email:   mailto:cesc++at++matrust.es  |
|   Matrust, S.L.                     Phone:   (34) 934.090.115        |
|   Barcelona - Spain                 Fax  :   (34) 934.090.116        |
+----------------------------------------------------------------------+








Hello all, 



I' ve been making more tests and I think I don't understand how polytopes
works concerning intersections. 



I made two test, as you can see below, with results that are very strange
for me. 



Is there anybody that can explain me what I'm doing wrong?

How can I test for collision between two objects (not between boundary
boxes).
Running Performer 2.2 on a Onyx RE2 with IRIX 6.2
Thanks again!!





********** TEST 1 ********************** 

=========================================== 

ptope1 (should be a cube) 

=========================================== 

pfPolytope: 0x1807acd0 6 facets 

_facets[0] 

pfPlane: normal 1.000000 0.000000 0.000000 

offset 1.000000 

_facets[1] 

pfPlane: normal 0.000000 1.000000 0.000000 

offset 1.000000 

_facets[2] 

pfPlane: normal 0.000000 0.000000 1.000000 

offset 1.000000 

_facets[3] 

pfPlane: normal -1.000000 0.000000 0.000000 

offset 1.000000 

_facets[4] 

pfPlane: normal 0.000000 -1.000000 0.000000 

offset 1.000000 

_facets[5] 

pfPlane: normal 0.000000 0.000000 -1.000000 

offset 1.000000 

=========================================== 

ptope2 (should be 3 planes) 

=========================================== 

pfPolytope: 0x1807ad00 3 facets 

_facets[0] 

pfPlane: normal 1.000000 0.000000 0.000000 

offset 2.000000 

_facets[1] 

pfPlane: normal 0.000000 1.000000 0.000000 

offset 2.000000 

_facets[2] 

pfPlane: normal 0.000000 0.000000 1.000000 

offset 2.000000 



pfPtopeContainsPtope(ptope2,ptope1) is 3 (I expected 7) 

pfPtopeContainsPtope(ptope1,ptope2) is 3 



********** TEST 2 ********************** 

=========================================== 

ptope1 (should be a cube) 

=========================================== 

pfPolytope: 0x1807acd0 6 facets 

_facets[0] 

pfPlane: normal 1.000000 0.000000 0.000000 

offset 1.000000 

_facets[1] 

pfPlane: normal 0.000000 1.000000 0.000000 

offset 1.000000 

_facets[2] 

pfPlane: normal 0.000000 0.000000 1.000000 

offset 1.000000 

_facets[3] 

pfPlane: normal -1.000000 0.000000 0.000000 

offset 1.000000 

_facets[4] 

pfPlane: normal 0.000000 -1.000000 0.000000 

offset 1.000000 

_facets[5] 

pfPlane: normal 0.000000 0.000000 -1.000000 

offset 1.000000 

=========================================== 

ptope2 (should be 4 planes, on more than in test1) 

=========================================== 

pfPolytope: 0x1807ad00 4 facets 

_facets[0] 

pfPlane: normal 1.000000 0.000000 0.000000 

offset 2.000000 

_facets[1] 

pfPlane: normal 0.000000 1.000000 0.000000 

offset 2.000000 

_facets[2] 

pfPlane: normal 0.000000 0.000000 1.000000 

offset 2.000000 

_facets[3]     <--- NEW 

pfPlane: normal -1.000000 0.000000 0.000000 

offset 2.000000 



pfPtopeContainsPtope(ptope2,ptope1) is 0  (I expected 7) 

pfPtopeContainsPtope(ptope1,ptope2) is 3 



-- 

+----------------------------------------------------------------------+

|   Francesc Blanes Kirchner         
Email:   mailto:cesc++at++matrust.es  |

|   Matrust, S.L.                    
Phone:   (34) 934.090.115       
|

|   Barcelona - Spain                
Fax  :   (34) 934.090.116       
|

+----------------------------------------------------------------------+

Next message: Luc Renambot: "Re: pf + sound + VR"
Previous message: Allan Schaffer: "Re: winopen and Iris Performer 2.0"

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