Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hi Mr. Robert, 

It worked for me. I have made Sphere from the osg Geometry. Thanks for the 
suggestion . 

... 

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hi Mr.Robert, 

I follow the idea given. I will get the grip on these topics and then , I will 
proceed towards goal TagCloud. 

Once again thanks for the suggestions. 

... 

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Robert Osfield]

Hi Inna,

I'm still stuck on trying to work out what bits of help you need.
Just repeating the same stuff but not providing additional information
about what specifically your stuck on doesn't help us.

The best I can do is suggest you have a look at other examples, for
instance osggeometry illustrates how you set up geometry.  The
osgshape example illustrates how to create renderable versions of the
shape primitives. The osgintersection example illustrates
intersections.

I think it would be worth you just learning more of the basics of what
is available in the OSG then moving on to your final goal as you seem
to have dived in to quickly and don't know enough of the basics.

Robert.
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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hi Mr. Wojtek, 

yes, Seems its valid one. I will test it as you suggested. Let me see :) 

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hello Mr.robertosfield , 

yes, I would appreciate the help receiving from you guys. I want to draw text 
on the osg:: sphere, which is exactly like osg fade text example. From this , I 
want to make Tag cloud. I am taking it step by step. Hopefully, I am on the 
right track in achieving this. 

Then I have tried with the example provided by the OSG Fade text which uses the 
Ellipsoid. then I got confused to convert this ellipsoid example in to Sphere. 
How can I convert this to sphere and draw text on it. 

Can some one please tell me, how to make this ? or any guide lines helpful. 

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Robert Osfield]

Hi Inna,

On 26 September 2016 at 22:42, Inna Reddy  wrote:
> Thanks for the reply. Sorry , Seems  I explained very badly . Well , my issue 
> is that I want to make sphere  and text on it. I was able to do with the 
> EllipsoidModel and using log , lat and height. I want to do the same with 
> same Sphere. But I dont have idea how to do with sphere the same thing. I 
> want to make sphere with radius which varys basing on the screen coordinates. 
> In osg::Sphere I can see setradius(), but how can i set radius to screen 
> coordinates ?

The osg::Sphere class is just a shape primitive it just provides a
position and a radius, the coordinate frame all depends on how you
want to use that data.

Computing positions on a sphere is easy, just a matter of sin and cos.
Do you need help with this?  There are plenty of guides on line on how
to do trigonometry of spheres.

Finally on the screen coordinate side, you'll need to give us some
context.  Are you trying to visualize the sphere?  In screen
coordinates?  Or are you just trying to map mouse coordinates to an
intersection point on geometry in the scene that you then attach a bit
of text to?

Robert.
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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Wojciech Lewandowski]

Hi,

Not sure if this helps but I believe you may define own Ellipsoid with
EllipsoidModel. Just define it with both Radii the same and voila you have
the sphere ...

Cheers,
Wojtek Lewandowski

2016-09-26 23:54 GMT+02:00 Sebastian Messerschmidt <
sebastian.messerschm...@gmx.de>:

> Hi Inna,
>
> It still doesn't make a lot of sense, The ellipsoid model is to abstract
> geographic coordinates to geocentric coords. Lat, long however is spherical
> coordinates and can be mapped to an ellipsoid...
> So please try  to rephrase your question: What is it what you want to do,
> or present some code that is not working for you.
>
> Cheers
> Sebastian
>
>> Hi Mr. Robert, geoc
>>
>> Thanks for the reply. Sorry , Seems  I explained very badly . Well , my
>> issue is that I want to make sphere  and text on it. I was able to do with
>> the EllipsoidModel and using log , lat and height. I want to do the same
>> with same Sphere. But I dont have idea how to do with sphere the same
>> thing. I want to make sphere with radius which varys basing on the screen
>> coordinates. In osg::Sphere I can see setradius(), but how can i set radius
>> to screen coordinates ?
>>
>> ...
>>
>> Thank you!
>>
>> Cheers,
>> Inna
>>
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>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=68777#68777
>>
>>
>>
>>
>>
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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Sebastian Messerschmidt]

Hi Inna,

It still doesn't make a lot of sense, The ellipsoid model is to abstract 
geographic coordinates to geocentric coords. Lat, long however is 
spherical coordinates and can be mapped to an ellipsoid...
So please try  to rephrase your question: What is it what you want to 
do, or present some code that is not working for you.


Cheers
Sebastian

Hi Mr. Robert, geoc

Thanks for the reply. Sorry , Seems  I explained very badly . Well , my issue 
is that I want to make sphere  and text on it. I was able to do with the 
EllipsoidModel and using log , lat and height. I want to do the same with same 
Sphere. But I dont have idea how to do with sphere the same thing. I want to 
make sphere with radius which varys basing on the screen coordinates. In 
osg::Sphere I can see setradius(), but how can i set radius to screen 
coordinates ?

...

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hi Mr. Robert, 

Thanks for the reply. Sorry , Seems  I explained very badly . Well , my issue 
is that I want to make sphere  and text on it. I was able to do with the 
EllipsoidModel and using log , lat and height. I want to do the same with same 
Sphere. But I dont have idea how to do with sphere the same thing. I want to 
make sphere with radius which varys basing on the screen coordinates. In 
osg::Sphere I can see setradius(), but how can i set radius to screen 
coordinates ? 

... 

Thank you!

Cheers,
Inna

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Re: [osg-users] OSG Ellipsoid to Sphere Conversion

[Robert Osfield]

Hi Inna,

You don't say what you've tried, only that you tried something
relating changing from EllipsoidModel to Sphere, you don't say what
you changed the code to, what the result you got.

Without knowing what you are specifically having a problem with we
can't start helping you achieve what you want to achieve.

Robert.

On 26 September 2016 at 18:05, Inna Reddy  wrote:
> Hi all,
>
> I am a new bie here. I was playing with some examples. From the FadeText 
> Example 
> http://trac.openscenegraph.org/projects/osg//browser/OpenSceneGraph/trunk/examples/osgfadetext/osgfadetext.cpp
>  .  In this example, I have the ellipsoid model from the lat, long and 
> height. It's clear, then I tried to change this to Sphere. For me it seems, 
> not possible to convert the Elliposid to sphere.
>
>
> Code:
> osgText::Text* createText(osg::EllipsoidModel* ellipsoid, double latitude, 
> double longitude, double height, const std::string& str)
> {
>
> double X, Y, Z;
>
> 
> ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(latitude), 
> osg::DegreesToRadians(longitude), height, X, Y, Z);
>
> osgText::Text* text = new osgText::FadeText;
> text->setDrawMode(osgText::Text::TEXT | 
> osgText::Text::BOUNDINGBOX);
>
> osg::Vec3 normal = ellipsoid->computeLocalUpVector(X, Y, Z);
> text->setCullCallback(new 
> osg::ClusterCullingCallback(osg::Vec3(X, Y, Z), normal, 0.0));
>
>
>
> ...
>
>  I am out of ideas, to do this possible to make same thing with sphere. Could 
> youe please some one help me to do this.
>
>
> thanks and cheers,
> Inna [/code]
>
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>
>
>
>
>
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[osg-users] OSG Ellipsoid to Sphere Conversion

[Inna Reddy]

Hi all, 

I am a new bie here. I was playing with some examples. From the FadeText 
Example 
http://trac.openscenegraph.org/projects/osg//browser/OpenSceneGraph/trunk/examples/osgfadetext/osgfadetext.cpp
 .  In this example, I have the ellipsoid model from the lat, long and height. 
It's clear, then I tried to change this to Sphere. For me it seems, not 
possible to convert the Elliposid to sphere. 


Code:
osgText::Text* createText(osg::EllipsoidModel* ellipsoid, double latitude, 
double longitude, double height, const std::string& str)
{

double X, Y, Z;


ellipsoid->convertLatLongHeightToXYZ(osg::DegreesToRadians(latitude), 
osg::DegreesToRadians(longitude), height, X, Y, Z);

osgText::Text* text = new osgText::FadeText;
text->setDrawMode(osgText::Text::TEXT | 
osgText::Text::BOUNDINGBOX);

osg::Vec3 normal = ellipsoid->computeLocalUpVector(X, Y, Z);
text->setCullCallback(new 
osg::ClusterCullingCallback(osg::Vec3(X, Y, Z), normal, 0.0));



...

 I am out of ideas, to do this possible to make same thing with sphere. Could 
youe please some one help me to do this. 


thanks and cheers, 
Inna [/code]

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