PinJoint2D: fix inertia tensor, taking center of mass into account
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@ -118,22 +118,26 @@ bool GodotPinJoint2D::setup(real_t p_step) {
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K1[0].y = 0.0f;
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K1[1].y = A->get_inv_mass() + B_inv_mass;
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Vector2 r1 = rA - A->get_center_of_mass();
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Transform2D K2;
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K2[0].x = A->get_inv_inertia() * rA.y * rA.y;
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K2[1].x = -A->get_inv_inertia() * rA.x * rA.y;
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K2[0].y = -A->get_inv_inertia() * rA.x * rA.y;
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K2[1].y = A->get_inv_inertia() * rA.x * rA.x;
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K2[0].x = A->get_inv_inertia() * r1.y * r1.y;
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K2[1].x = -A->get_inv_inertia() * r1.x * r1.y;
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K2[0].y = -A->get_inv_inertia() * r1.x * r1.y;
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K2[1].y = A->get_inv_inertia() * r1.x * r1.x;
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Transform2D K;
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K[0] = K1[0] + K2[0];
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K[1] = K1[1] + K2[1];
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if (B) {
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Vector2 r2 = rB - B->get_center_of_mass();
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Transform2D K3;
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K3[0].x = B->get_inv_inertia() * rB.y * rB.y;
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K3[1].x = -B->get_inv_inertia() * rB.x * rB.y;
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K3[0].y = -B->get_inv_inertia() * rB.x * rB.y;
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K3[1].y = B->get_inv_inertia() * rB.x * rB.x;
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K3[0].x = B->get_inv_inertia() * r2.y * r2.y;
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K3[1].x = -B->get_inv_inertia() * r2.x * r2.y;
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K3[0].y = -B->get_inv_inertia() * r2.x * r2.y;
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K3[1].y = B->get_inv_inertia() * r2.x * r2.x;
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K[0] += K3[0];
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K[1] += K3[1];
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