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  Problem with mass proporties in odejava  (Read 945 times)
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Offline lucas

Junior Newbie





« Posted 2006-04-11 19:44:47 »

Hi,

I have a small problem concerning inertia tensors in odejava. When I set the mass proporties with values from the tensor (as shown below) rather unphysical behaviour result, the body isnĀ“t rotating as it should. If the cube is slowly pushed over an edge, it rotates almost nothing when falling free. However, if i do not set the massparameters the cube does behave normally.

I really need to use the tensor because i ultimately intend to simulate convex hulls. Here are the parameters I use:

float box_side = 0.0198f
float box_mass = 0.0203f; //density = 2600kg/m3

//tensor
float[][] it =  {{6.5703505E-5f,  -0.0f,  -0.0f},
      {-0.0f,  6.5703505E-5f,  -0.0f},
      {-0.0f,  -0.0f,  6.5703505E-5f}};
      
box.setMassParameters(mass, 0, 0, 0, it[0][0], it[1][1], it[2][2], 0, 0, 0);

Does anyone know what's causing my problem??
Thanks,
Lucas
Offline lucas

Junior Newbie





« Reply #1 - Posted 2006-04-12 09:17:44 »

Well, The problem was easley fixed, the tensor should be multiplied by the mass..

/lucas
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