btConvexPointCloudShape not scaling

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mgs_oleg
Posts: 10
Joined: Mon Jun 08, 2015 6:25 pm

btConvexPointCloudShape not scaling

Post by mgs_oleg » Sat Jan 12, 2019 11:08 pm

When I am using btConvexPointCloudShape and setting localScaling it is not afftected
How properly scale btConvexPointCloudShape object ?
my scale is
vec3(3.000000, 6.000000, 1.000000)

mgs_oleg
Posts: 10
Joined: Mon Jun 08, 2015 6:25 pm

Re: btConvexPointCloudShape not scaling

Post by mgs_oleg » Sun Jan 13, 2019 12:49 pm

can someone help me here how to properly use this collision shape ?

niad
Posts: 7
Joined: Sun Mar 11, 2018 9:34 am

Re: btConvexPointCloudShape not scaling

Post by niad » Tue Jan 15, 2019 9:04 am

I don't use that class, but glancing at the code(localGetSupportingVertexWithoutMargin) I'd say the scaling is applied too late-- shouldn't matter if you are doing uniform scaling but with (3,6,1) I'd guess it would produce incorrect results.

Try changing this code in localGetSupportingVertexWithoutMargin:


int index = (int)vec.maxDot(&m_unscaledPoints[0], m_numPoints, maxDot); //FIXME: may violate encapsulation of m_unscaledPoints
return getScaledPoint(index);

To This:

vec = vec * m_localScaling;
int index = (int)vec.maxDot(&m_unscaledPoints[0], m_numPoints, maxDot); //FIXME: may violate encapsulation of m_unscaledPoints
return getScaledPoint(index);

mgs_oleg
Posts: 10
Joined: Mon Jun 08, 2015 6:25 pm

Re: btConvexPointCloudShape not scaling

Post by mgs_oleg » Tue Jan 15, 2019 9:19 am

thanks niad. let me try. I will get back in short with results

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