Hi, I don't know if this is possible. I have some files from GRASS with .pov 
extension and I don't know how to take them for osg.

Someone know the structure of a tga file?

For example:
An edifice:
polygon { 6, 
 <464022.599606, 907.085815 , 4087154.860413>
 <464004.190265, 907.085815 , 4087142.339932>
 <464004.190265, 937.085815 , 4087142.339932>
 <464022.599606, 937.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 <464022.599606, 907.085815 , 4087154.860413>
 
}

A river:
sphere_sweep { linear_spline 45,
 <465739.968762, 1906.192505 , 4091458.499904>, 3
 <465791.468761, 1894.422974 , 4091452.250001>, 3
 <465821.250068, 1881.933472 , 4091422.250052>, 3
 <465860.593730, 1856.298828 , 4091382.249947>, 3
 <465892.375120, 1835.943359 , 4091347.999919>, 3
 <465930.218784, 1816.068726 , 4091315.500061>, 3
 <465978.812602, 1801.638184 , 4091290.250017>, 3
 <466026.968878, 1793.834595 , 4091275.750128>, 3
 <466076.624893, 1786.617188 , 4091255.249991>, 3
 <466120.343720, 1770.884644 , 4091223.750044>, 3
 <466161.875093, 1742.642090 , 4091171.500047>, 3
 <466189.468689, 1710.575928 , 4091081.000114>, 3
 <466219.343810, 1704.088501 , 4091067.499878>, 3
 <466268.312628, 1696.643555 , 4091062.999886>, 3
 <466301.593757, 1684.553589 , 4091025.499950>, 3
 <466350.250118, 1668.899048 , 4091009.249891>, 3
 <466384.499888, 1657.378906 , 4091005.000071>, 3
 <466438.343697, 1631.369019 , 4091002.750074>, 3
 <466494.156318, 1608.742310 , 4090996.499913>, 3
 <466546.906142, 1593.277832 , 4090985.249932>, 3
 <466588.906329, 1576.062622 , 4090959.749975>, 3
 <466618.093736, 1551.168579 , 4090918.999872>, 3
 <466659.343666, 1524.220459 , 4090896.499910>, 3
 <466689.250059, 1511.777832 , 4090889.500008>, 3
 <466738.187606, 1496.778687 , 4090879.500111>, 3
 <466778.656265, 1482.590088 , 4090853.500069>, 3
 <466812.656122, 1460.842041 , 4090812.249881>, 3
 <466858.718759, 1430.692139 , 4090788.750007>, 3
 <466883.218803, 1414.062012 , 4090769.499954>, 3
 <466930.843722, 1400.582275 , 4090747.500077>, 3
 <466986.437443, 1388.464478 , 4090744.500082>, 3
 <467017.156377, 1384.399048 , 4090743.000085>, 3
 <467045.781157, 1377.151001 , 4090732.999929>, 3
 <467085.218633, 1362.496216 , 4090705.999975>, 3
 <467134.499907, 1343.728149 , 4090706.500060>, 3
 <467193.062609, 1319.315430 , 4090726.500113>, 3
 <467244.687435, 1301.977539 , 4090737.250008>, 3
 <467287.999991, 1298.845825 , 4090758.000059>, 3
 <467319.781122, 1293.567383 , 4090798.250077>, 3
 <467364.031306, 1282.700684 , 4090843.499914>, 3
 <467408.187416, 1266.867310 , 4090874.500034>, 3
 <467457.843689, 1245.734619 , 4090893.000088>, 3
 <467509.187589, 1222.203979 , 4090897.749994>, 3
 <467561.999956, 1193.638428 , 4090893.750087>, 3
 <467614.875125, 1189.556030 , 4090899.499905>, 3
 
}

Thanks!!

------------------
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http://forum.openscenegraph.org/viewtopic.php?p=29805#29805





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