It seems that you already know more than me on this subject. May be there is a sense to use simple approach. Treat cube as a circle and test whether touch point is in that circle or not. Of course it's less accurate and you need to define cube center somehow.
On Jun 18, 12:21 pm, quill <[email protected]> wrote: > Thank you Nightwolf. > I want to choose the Kube when I touch on the Kube face in order to > rotate Kube. > My idea is: > 1. to get vertices of Kube to compose a polygon(2D); > 2. judge if the touch point locates in the polygon; > As you said, the cube coordinates is not modified, so I use > gluunproject() to change touch point coordinates(x, y, 0) in order to > map window coordinates to object coordinates, and then I judged if the > new touch point coordinates locates in the polygon. Am I on the right > way? > > On Jun 18, 11:59 am, Nightwolf <[email protected]> wrote: > > > > > Cube coordinates are stored in vertices array in Cube.java. > > Rotating effect is achieved via model view matrix modification > > (glTranslate and glRotate commands). Original vertex data isn't > > modified. > > > On Jun 17, 8:30 pm, quill <[email protected]> wrote: > > > > Hi all, > > > I'm modifying Kube(api demo) to a game, does anyone who know how to > > > get the vertice coodinates of Kube? From the source code in api demo, > > > I think GLWorld.mVertexBuffer may save the vertice coodinates after > > > rotate the Kube, but I was wrong, the infomation in mVertexBuffer > > > always remains the same.- Hide quoted text - > > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
