Re: [Flightgear-devel] OSG spotlights

2007-11-20 Thread Markus Zojer 
Thanks for the info Yurik!

Regarding performance, using 1 additional spotlight, I could not obtain any 
major differences (maybe an increase of about 2% cpu usage, but since recent 
cvs/osg2.2 uses about 85-90% on my cpu (amd xp2000) constantly it is hard to 
tell).

The second problem of not lightened surfaced exists, but can be optimized a bit 
by adjusting spot cutoff and light distance attenuation.

However it seems that we are going for shaders/multitexturing here, 
unfortunatly I am not familiar with shaders.

g,
markus



Yurik V. Nikiforoff wrote:
 В сообщении от 18 ноября 2007 Markus Zojer написал(a):
   
 Hi there!

 Maybe I missed something, but under OSG/opengl it should be able to
 create up to 8 light sources.
 

 Please, read this first:
 http://sourceforge.net/mailarchive/message.php?msg_id=200610270754.15858.Mathias.Froehlich%40gmx.net


   


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Re: [Flightgear-devel] OSG spotlights

2007-11-20 Thread Yurik V. Nikiforoff 
Hi Markus!
В сообщении от 20 ноября 2007 Markus Zojer написал(a):
 The second problem of not lightened surfaced exists, but can be optimized a
 bit by adjusting spot cutoff and light distance attenuation.

Unfortunatelly, spot parameters can't resolve problem of spot lighting for big 
surfaces. Big - it mean size of triangles too big rather then size of spot 
light, for example, if we want create landing lights. Limits of spread of 
lights for big surfases don't allow create realistic landing lights. 

For small surfases, then distance from light source greate then appprox size 
between surface vertex, we have good result. 

So, if we want landing lights, we should find another lights system. 

-- 
Wbr, Yurik

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[Flightgear-devel] OSG spotlights

2007-11-18 Thread Markus Zojer 
Hi there!

Maybe I missed something, but under OSG/opengl it should be able to 
create up to 8 light sources.

I used some simple osg code to generate a spotlight but it works only if 
I define it as light_num 0, which corresponds the GL_LIGHT0 of opengl I 
suppose, and this setting causes generic lightning to dissappear.

Now some questions to someone with more insight into OSG:
Is it possible to add lights when modifying the code below or is there a 
current limitation in flightgear that prevent lights from being added?
I had a quick look into renderer.cxx and it seems that our global 
lighting is linked with osg there, but I am no programmer and I don't 
know how our lighting system actually works.

Here the code I used (when GL_LIGHT1 and light_num 1 were used,nothing 
appeared):
  LightSource {
  UniqueID LightSource_2
  DataVariance STATIC
  nodeMask 0xff
  cullingActive FALSE
  StateSet {
DataVariance STATIC
rendering_hint DEFAULT_BIN
renderBinMode INHERIT
GL_LIGHTING ON
GL_LIGHT0 ON
GL_DEPTH_TEST ON
  }
  referenceFrame RELATIVE
  Light {
UniqueID LightSource_3
DataVariance STATIC
light_num 0 //0 works but global light turned off
ambient 0.2 0.2 0.2 1
diffuse 1 1 1 1
specular 0 0 0 0
position 0 0 0 1
direction -1 0 0
constant_attenuation 1
linear_attenuation 0
quadratic_attenuation 0
spot_exponent 2
spot_cutoff 15
  }
  num_children 0
}

fly on,
markus

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Re: [Flightgear-devel] OSG spotlights

2007-11-18 Thread Markus Zojer 
Ok, I somehow got it to work:

added the following lines to /src/main/renderer.cxx (somewhere in the 
class SGPuDrawable block)

stateSet-setMode(GL_LIGHTING, osg::StateAttribute::ON);
stateSet-setMode(GL_LIGHT0, osg::StateAttribute::ON);
stateSet-setMode(GL_LIGHT1, osg::StateAttribute::ON);
stateSet-setMode(GL_LIGHT2, osg::StateAttribute::ON);
stateSet-setMode(GL_LIGHT3, osg::StateAttribute::ON);
stateSet-setMode(GL_LIGHT4, osg::StateAttribute::ON);

recompiled flightgear and changed the parameters in the lighting file to 
GL_LIGHT4 and light_num 4, and it works: I have ambient light and some 
sort of spotlight (wich I had to adjust a bit) now.
Not sure if it breaks anything, was just a quick shot ;-)

fly on,
markus

Markus Zojer wrote:
 Hi there!

 Maybe I missed something, but under OSG/opengl it should be able to 
 create up to 8 light sources.

 I used some simple osg code to generate a spotlight but it works only if 
 I define it as light_num 0, which corresponds the GL_LIGHT0 of opengl I 
 suppose, and this setting causes generic lightning to dissappear.

 Now some questions to someone with more insight into OSG:
 Is it possible to add lights when modifying the code below or is there a 
 current limitation in flightgear that prevent lights from being added?
 I had a quick look into renderer.cxx and it seems that our global 
 lighting is linked with osg there, but I am no programmer and I don't 
 know how our lighting system actually works.

 Here the code I used (when GL_LIGHT1 and light_num 1 were used,nothing 
 appeared):
   LightSource {
   UniqueID LightSource_2
   DataVariance STATIC
   nodeMask 0xff
   cullingActive FALSE
   StateSet {
 DataVariance STATIC
 rendering_hint DEFAULT_BIN
 renderBinMode INHERIT
 GL_LIGHTING ON
 GL_LIGHT0 ON
 GL_DEPTH_TEST ON
   }
   referenceFrame RELATIVE
   Light {
 UniqueID LightSource_3
 DataVariance STATIC
 light_num 0 //0 works but global light turned off
 ambient 0.2 0.2 0.2 1
 diffuse 1 1 1 1
 specular 0 0 0 0
 position 0 0 0 1
 direction -1 0 0
 constant_attenuation 1
 linear_attenuation 0
 quadratic_attenuation 0
 spot_exponent 2
 spot_cutoff 15
   }
   num_children 0
 }

 fly on,
 markus

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Re: [Flightgear-devel] OSG spotlights

2007-11-18 Thread Yurik V. Nikiforoff 
В сообщении от 18 ноября 2007 Markus Zojer написал(a):
 Hi there!

 Maybe I missed something, but under OSG/opengl it should be able to
 create up to 8 light sources.

Please, read this first:
http://sourceforge.net/mailarchive/message.php?msg_id=200610270754.15858.Mathias.Froehlich%40gmx.net


-- 
Wbr, Yurik

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