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2017-05-23 04:30:58 -0500	marked best answer	Sonar sensor cone has a collision Hello! I want to place a sonar sensor on a box and looking for objects on scene by moving that box. But sonar cone doesn't intersects with objects, but collides with them. This looks as sonar cone has a collision. I attached some screenshots and example world. Maybe someone knows how can I solve this? Thanks! sonar_sensor_example_dart.world
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2017-05-23 04:30:35 -0500	commented answer	Sonar sensor cone has a collision Thank you very much for your answer!
2017-05-23 04:30:31 -0500	commented answer	Ray sensor doesn't work properly with DART Thank you very much!
2017-05-22 07:27:28 -0500	asked a question	Sonar sensor cone has a collision Sonar sensor cone has a collision Hello! I want to place a sonar sensor on a box and looking for objects on scene by mo
2017-05-22 07:21:14 -0500	asked a question	Ray sensor doesn't work properly with DART Ray sensor doesn't work properly with DART When I use ray sensor with DART engine its rays always go throught objects bo
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2015-08-14 08:21:22 -0500	asked a question	Physics during robot movement Hi, all! When I move joints using setPosition() method, for example, to make my humanoid robot take a seat, it hangs in the air while setPosition() method called and then it falls down. It looks like there is no gravity, or like animation and physics can not run together. I use ODE engine. Could you help me to understand reason of this problem?
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2015-08-05 07:46:53 -0500	asked a question	Perfectly elastic and inelastic collision using ODE Hi, all! I'm trying to simulate some tests in GAZEBO with robot. One of the tests is perfectly elastic and inelastic collision between robot and small sphere. The physic's engine is ODE. Sphere is attached to the the stick that can be deflected by some angle and then falls back under gravity and hits my robot. There is no friction between soles of foots of the robot and floor. I had setting <mu> and <mu2> parameters in link -> collision -> surface -> friction -> ode to 0 in ground_plane model and in model of my robot for foots. For bounce I had setting <restitution_coefficient>, <threshold> and <max_vel>, as described here: http://answers.gazebosim.org/question/678/a-simple-question-on-changing-bounce-properties/. The experiments revealed that velocity of sliding of the robot after the hit not depends on the mass of the sphere. If I hit my robot with the 40 kg sphere and then with 4000 kg, it slides with the same velocity. But if I reduce mass of the sphere to some small value, for example 5 kg, then sliding speed is reducing. Can you help me to resolve this problem and get any advice, please? Is there any examples of elementary physic's tests?