Hi Robert,
I think you are right.
I am tring to use the PIXEL_SIZE_ON_SCREEN mode of LOD, and the most important
is how to get a proper piexl threshold which used in the setRange(). So I want
toknow is there a method to compute the pixel of the bounding sphere without
the matrix (W, P, M).
My method is piexlParameter = bound.radius * bound.radius * C, and C is a
empirical value. Is there a better method?
I am looking forward to your reply.
Young.
------------------ ???????? ------------------
??????: "Robert Osfield";<[email protected]>;
????????: 2017??7??31??(??????) ????7:34
??????: "OpenSceneGraph Users"<[email protected]>;
????: Re: [osg-users] ?????? Understanding osg::CulingSet::pixelSize()
andcomputePixelSizeVector()
Hi Young,
On 31 July 2017 at 10:19, Young <[email protected]> wrote:
Is _pixelSizeVector meaning the ratio of space distance to screen pixel?
I don't recall off the top of my head, but looking at the code from CullingSet:
/** Compute the pixel of an object at position v, with specified
radius.*/
float pixelSize(const Vec3& v,float radius) const { return
radius/(v*_pixelSizeVector); }
The _pixelSizeVector is a set of ratio that give the size in local coordinates
of a pixel in screen space projected to a given distance away from the eye
point.
I'm not wording this well, it's a very long time since thought about the code -
it's not a bit of the OSG discussed much, it just quietly works away doing it's
job. I've written lots of code over the years and if it works fine you really
don't need to retain much knowledge about it...
Robert._______________________________________________
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