How to rotate vertices ?

Comments

• pie Member

  March 2019

  @gemboy100 I know it's not the same thing but the effect should be similar: did you think about using RenderTarget on the groups of vertices and rotate the resulting objects (Sprites/Bitmaps)?

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• oleg Member

  March 2019

  mesh:setRotationX(mesh:getRotationX()+30)

  my games:
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• gemboy100 Member

  March 2019

  @pie Ill try a bit harder to do it with mesh before I go with that : )
  
  @oleg That cmd rotates whole mesh obj, I wanted to rotate only selected vertices from vertexArray, not sure if I was very clear what I want to achieve
  
  

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• hgy29 Maintainer

  March 2019

  I think you must create a mesh for each glass fragment, then you can move/rotate each fragment independently.

  Likes: oleg

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• keszegh Member

  March 2019

  no need to separate meshes, just some basic vector operations, look for tutorials, or classes, e.g. try https://github.com/bjornbytes/maf although it is 3d, you emulate 2d rotation too with it.

  Likes: gemboy100

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• keszegh Member

  March 2019 Accepted Answer

  even better, check this https://2dengine.com/?p=vectors

  Likes: gemboy100

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• SinisterSoft Maintainer

  March 2019

  Better if it can be done in the single mesh - then still only one object to draw.

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• hgy29 Maintainer

  March 2019

  SinisterSoft said:

  Better if it can be done in the single mesh - then still only one object to draw.

  Well not in gideros: lua is rather slow and modifying vertices means reuploading them to GPU. On the other hand gideros rendering pipeline is very close to the GPU, and transforming an existing mesh (rotate/translate) is just a matter of changing its associated transform matrix, which is reuploaded to the GPU on each draw call anyway
  

  Likes: oleg, SinisterSoft

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• gemboy100 Member

  March 2019 edited March 2019

  @keszegh great links, nice and simple tutorial, even I could understand most of it
  

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• keszegh Member

  March 2019

  hgy29 said:

  
  Well not in gideros: lua is rather slow and modifying vertices means reuploading them to GPU. On the other hand gideros rendering pipeline is very close to the GPU, and transforming an existing mesh (rotate/translate) is just a matter of changing its associated transform matrix, which is reuploaded to the GPU on each draw call anyway
  

  that's surprising, would be interesting to see benchmark comparison.
  

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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• gemboy100 Member

  March 2019

  http://forum.giderosmobile.com/discussion/1887/improve-performnace-with-mesh
  
  Btw., forum search tool acts kind of weird, I always have to go trough google

  site:forum.giderosmobile.com word

  Likes: keszegh

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• keszegh Member

  March 2019

  another way could be by using shaders i guess.

  Likes: SinisterSoft

  Longtitle Productions, creator of
  Fragmenter - animated loop machine and IKONOMIKON - the memory game

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