Mathias Fröhlich wrote: >Hi, > >Hi, > >On Saturday 26 May 2007, Nick Warne wrote: > > >>I decided to start a new clean thread here, so people can find what they >>need to build FG to perform. >> >>As we know, using the CMAKE command: >> >>cmake -i . >> >>produces a question/answer type script so you can build as a 'Release' and >>configure any optimisations to suit. >> >>Using: >> >>./configure CXXFLAGS= -O3 ... >> >>will build Simgear/FG with similar optimisations. >> >> >>Today I tested again OSG, and there are two options that made me wonder - >>so I turned ON to use a float matrix rather than double: >> >>//Set to ON to build OpenSceneGraph with float matrix instead of >>// double. >>OSG_USE_FLOAT_MATRIX:BOOL=ON >> >>//Set to ON to build OpenSceneGraph with float matrix instead of >>// double. >>OSG_USE_FLOAT_PLANE:BOOL=ON >> >> >That is bad idea. >That clamps the available precision of the transform matrices to floats which >is no longer enough. > >Are you on win32? > > Greetings > > Mathias > > > Are we talking about the matrices used for the culling and the rendering ? If that's the case then we don't need precision for culling and the gpu does nothing with doubles, they have allready some trouble to use floats efficiently.
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