> > (1) I want to convert the EPT format, to the pagedlod format and saved as > osgb file, is it possible for pagedlod that both parent and it's child are > both drawn? >
Normally, no. OSG's underlying Group system allows only one LOD to be drawn at a time, though lower LODs are actually retained in memory as loaded. The way most OSG PagedLOD databases are built (the way VPB for example builds databases) is that LOD 0 will be the low-res version and LOD 1 will contain four sub-pieces at higher res, each of which is the LOD 0 of another PagedLOD. You could either 1. Write a specialized variant of PagedLOD that displayed the lower LOD automatically (not recommended) 2. Build your PagedLODs carefully so that PageLOD level 0 contains the lowest detail point data, and LOD 1 contains that same data PLUS the four child PagedLODs. I believe if you link things together properly, the two copies of LOD 0 will only be stored in memory once and drawn once. (2) The laz file also contains other attributes, such as lables (interger), > return number (interger), I also want to implement shaders to render color > by different attribute, is it possible to save these attribute in osgb and > correctly bind the vertext buffer to the same program location? > Yes. You can store these values as attributes and access them in a shader to control rendering. > Thank you! > Cheers, > Han > -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Training • Consulting • Contracting 3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 • GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL Legal/IP • Forensics • Imaging • UAVs • GIS • GPS • osgEarth • Terrain • Telemetry • Cryptography • LIDAR • Embedded • Mobile • iPhone/iPad/iOS • Android @alphapixel <https://twitter.com/alphapixel> facebook.com/alphapixel (775) 623-PIXL [7495]
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