Rolling a ball on a platform according to the platform;s slope

News & General Discussion
1

Hi, i am new to unity. can anyone tell me how to make a ball roll over a platform according to the slope of the platform with some speed. i applied the physic material and rigidbody but the ball falls very slow on the platform and rolls very slowly.

2

You need to adjust the balls mass and play with the friction.

http://unity3d.com/support/documentation/Manual/Physics.html

3

Besides what MakerOfGames pointed out, consider your scale. There’s a warning about choosing too large a scale and the resulting apparent slow motion at the top of Unity’s physics documentation.

4

Thanks for the information. I tried that way but i am still not getting the desired effect. What i want to do is,

  1. Roll a ball with some speed on a plane.
  2. Control the ball’s direction by changing the direction of the slope of the plane.

Do i have to use scripting for that. If yes then pls tell me how to go about doing that.

5

Again, consider your scale as explained at the top of the Unity’s physics documentation.

I achieved this in a couple minutes with zero scripting by simply playing with friction and the plane’s angle. Unity’s built-in physics engine does the rest. Now, if you want to modify the angle of the plane on the fly, for that you may need to write some code. :slight_smile:

6

Thanks Ostagar for taking the trouble of making the video for me. I got the desired effect i wanted. Though what i did was change the gravity to something -200 in physics settings of the project settings. Is this ok or a wrong way to do? I created a sphere and changed its scale value to 75. Is this also wrong? Thanks again for the quick replies.

7

Razor, if that’s all you need your program to do, and it’s working now, then it’s probably fine. :slight_smile:

But realize what you’ve done–you’re created a sphere larger than my house and set the gravity to be similar to Jupiter’s… If you plan to extend this program by adding more physics-controlled objects or more objects that act on your sphere, it’s worth correcting the physics early on.

8

Thanks Ostagar for the last comment:smile:. That was an excellent way to put it. I pictured what u wanted to say and followed u r advice. Now everything is working great, i set gravity to default. Earlier what i had done was that i had created the plane and the sphere in the default unity viewport setting because of which i had scaled the objects as i could not see them. As soon as i read u r example, i realized my mistake. Thanks.