[osg-users] how to draw a Curved Surface?

[Christian Buchner]

If your terrain surface uses a GLSL fragment shader, you could add a 2D
point in polygon test on the x/y coordinate and add or blend a highlighting
color to the generated fragment when it passes the PIP test. It might get
kind of slow when your enclosing polygons has a lot of vertices.

For a decent PIP test algorithm, look here:
http://stackoverflow.com/questions/11716268/point-in-polygon-algorithm


2015-11-18 12:58 GMT+01:00 Sebastian Messerschmidt <
sebastian.messerschmidt at gmx.de>:

> Hello Bean?
>
> You can use the polytop intersector to get all primitives inside and draw
> them with an polygon offset applied on top of the original geometry.
>
> Cheers
> Sebastian
>
> primitive problem
>
> <https://groups.google.com/forum/#%21searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ>
>
>
> <https://groups.google.com/forum/#%21searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ>
>
>
> 1、how to draw a Curved Surface on the top of terrain? like the fig.
> 2、 how to compute the surface area of the Curved Surface?
> [image: 内嵌图片 1]
> I  want to use  polytope intersector, but I don't have  inspiration. So
> can you give me some advise?
> thank you a lot.
>
>
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