[Liblas-devel] libLAS 1.6.1 - Can't read color in Point Format 2

[Ryan W. Frenz]

Just wanted to revisit this; I have confirmed that this issue still 
exists in 1.7.0 and in latest from GitHub.  Any thoughts?  Is there no 
way to get RGB into an LAS file using liblas?

Thanks,
Ryan

On 11/8/2011 4:15 PM, Ryan W. Frenz wrote:
> It seems I am unable to read RGB color from points in point format 2.
> Using the code snippets below, I write 10 points to a LAS file, with RGB
> color, and then read it back.  I can read back the coordinates properly
> but not the color (I get RGB=0,0,0 for all points).  Anything jump out
> that I'm doing wrong?  Could someone point me to some sample data in
> point format 2 that I could use for testing?
>
> Notes:
>   - This same code works properly using Point Format 0 and
> Set/GetIntensity instead of Color.
>   - I am performing this test using libLAS 1.6.1 compiled for Windows
> (same results in 32 and 64 bit).
>
> Thanks in advance,
> Ryan
>
> void write(const std::string& filename) {
>      std::ofstream out(filename, std::ios::binary);
>      liblas::Header h;
>      h.SetDataFormatId(liblas::ePointFormat2);
>      h.SetPointRecordsCount(10);
>      h.SetPointRecordsByReturnCount(1, 10);
>      h.SetScale(0.001, 0.001, 0.001);
>      h.SetOffset(0,0,0);
>
>      liblas::Writer w(out, h);
>      for (double i = 0; i <= 1.0; i+=0.1) {
>        liblas::Point p;
>        p.SetX(i);  p.SetY(i); p.SetZ(i);
>        liblas::Color c;
> c.SetRed(static_cast<liblas::Color::value_type>(std::numeric_limits<liblas::Color::value_type>::max()
> * i));
> c.SetGreen(static_cast<liblas::Color::value_type>(std::numeric_limits<liblas::Color::value_type>::max()
> * i));
> c.SetBlue(static_cast<liblas::Color::value_type>(std::numeric_limits<liblas::Color::value_type>::max()
> * i));
>        p.SetColor(c);
>        w.WritePoint(p);
>      }
>      out.close();
> }
>
> void read(const std::string& filename) {
>      std::ifstream in(filename, std::ios::binary);
>      liblas::Reader reader(in);
>      int ct = 0;
>      while ((ct < 10) && reader.ReadNextPoint()) {
>        const liblas::Point& p = reader.GetPoint();
>        std::cerr << p.GetX() << ", " << p.GetY() << ", " << p.GetZ() <<
> ", " << p.GetColor().GetRed() << ", " << p.GetColor().GetGreen() << ", "
> << p.GetColor().GetBlue() << "\n";
>        ++ct;
>      }
>      in.close();
> }
>


-- 
Ryan W. Frenz
Head of Software Development
Allpoint Systems
1936 Fifth Ave
Pittsburgh, PA 15219
o: 412.444.5149
e: ryan at allpointsystems.com

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