Re: [osg-users] Unwanted effect with two effect nodes in the line of sight (see-through)

2013-10-02 Thread Florian Kolbe 
Ok, I think I solved it.
There is quite a catch to the following OSG FX method:


Code:
void Technique::addPass(osg::StateSet* ss)
{
if (ss) {
_passes.push_back(ss);
ss-setRenderBinDetails(static_castint(_passes.size()), RenderBin);
}
}



Then again, this is was setRenderingHints does (yes, that's source code comment 
is in there, it's the 3.2.0 source):


Code:
void StateSet::setRenderingHint(int hint)
{
_renderingHint = hint;
// temporary hack to get new render bins working.
switch(_renderingHint)
{
case(TRANSPARENT_BIN):
{
_binMode = USE_RENDERBIN_DETAILS;
_binNum = 10;
_binName = DepthSortedBin;
break;
}
case(OPAQUE_BIN):
{
_binMode = USE_RENDERBIN_DETAILS;
_binNum = 0;
_binName = RenderBin;
break;
}
default: // DEFAULT_BIN
{
setRenderBinToInherit();
break;
}
}
}



So what I did before (in Technique::add_passes) did NOT work:


Code:

stateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);   
addPass(stateSet.get());




But reversing the order DOES work:

Code:

addPass(stateSet.get());
stateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);   



The order makes the difference since both have functionality similar to 
setRenderBinDetails - but with different settings.

Good to know how addPass() and setRenderingHint() work.

Is my interpretation correct?

Cheers,
Florian

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Re: [osg-users] Unwanted effect with two effect nodes in the line of sight (see-through)

2013-10-01 Thread Florian Kolbe 
Hi David and all,
  thank you for taking your time to answer this. To make things clear, I am 
using self-written subclasses of the Effect class (from the osgFX namespace).

Simply adding the second pass to the transparent bin did not help.

Though I have to admit I do not have the expertise (yet) to understand the 
interaction between multi-pass and multi-bin.

I suspect that I need a transparency effect in two passes, not in one pass.
This would explain why the single pass transparency occludes my second pass of 
the other effect node, right?

I would like to understand this a bit more, before I start trying things out, 
so my question are:
1. how do multi-pass and multiple bins play together?
2. if have nodes using two-pass rendering, does my transparency effect node 
also need two-pass (AND transparent bin) in order to take effect OVER the other 
effect nodes?

As another hint: I am also using the built-in osgFX::Scribe node which suffers 
from the effect, that the scribed nodes gets completely occluded by the 
transparent wall (left, in the attached screenshot scribe-gets-occluded.png).

Thank you!

Cheers,
  Florian

Links I found (relevant?):
http://forum.openscenegraph.org/viewtopic.php?t=11180
http://forum.openscenegraph.org/viewtopic.php?t=12791

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[osg-users] Unwanted effect with two effect nodes in the line of sight (see-through)

2013-09-25 Thread Florian Kolbe 
Hi,

1. for transparent walls we use our own node (derived from Effect) - see code 
below
2. for tinting objects, we also use an effect node derived from Effect - 
see code below

Used by themselves, everything works fine. But if we have a tinted object 
behind a transparent object, the tinting effect is gone (see screenshot).

Code for transparency effect:

Code:
void define_passes()
{
// implement pass #1
{
// s.a. http://www.mail-archive.com//msg13796.html
osg::ref_ptrosg::StateSet stateSet = new osg::StateSet;

// mat
osg::Material* mat = new osg::Material;
mat-setAlpha(osg::Material::FRONT_AND_BACK, alpha);
stateSet-setAttributeAndModes(mat, osg::StateAttribute::ON | 
osg::StateAttribute::OVERRIDE);

// backface culling, führt dazu dass innere Rückseiten nicht 
angezeigt werden
osg::CullFace* cull = new osg::CullFace();
cull-setMode(osg::CullFace::BACK);
stateSet-setAttributeAndModes(cull, osg::StateAttribute::ON);

// turn on blending
osg::BlendFunc* bf = new 
osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::ONE_MINUS_SRC_ALPHA );
stateSet-setMode(GL_BLEND, osg::StateAttribute::ON | 
osg::StateAttribute::OVERRIDE);
stateSet-setAttributeAndModes(bf);
// rendering hints
stateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
// lighting
stateSet-setMode(GL_LIGHTING, osg::StateAttribute::OFF);

addPass(stateSet.get());
}
}



Code for coloring effect:

Code:
void define_passes()
{
// implement pass #1 - draw original with a little offset
{
osg::ref_ptrosg::StateSet ss = new osg::StateSet;

osg::ref_ptrosg::PolygonOffset polyoffset = new 
osg::PolygonOffset;
polyoffset-setFactor(1.0f);
polyoffset-setUnits(1.0f);
ss-setAttributeAndModes(polyoffset.get(), 
osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

addPass(ss.get());
}
// implement pass #2 - draw tinted
{
osg::ref_ptrosg::StateSet ss = new osg::StateSet;
// Material überschreiben
ss-setAttributeAndModes(_wf_mat.get(), 
osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

// notwendig, damit alpha greift

ss-setMode(GL_BLEND,osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE);

addPass(ss.get());
}
}



See attached image:
The fire extinguisher should be all yellow, but behind the transparent wall - 
it is as if it was rendered without the effect.

I hope someone can sched some light on this issue?

Thank you!

Florian

PS sorry if the code snippets come out weird, leading space for indentation 
somehow goes wrong...[/img][/code]

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Re: [osg-users] Unwanted effect with two effect nodes in the line of sight (see-through)

2013-09-25 Thread David Callu 
Hi Florian

We can't really help you without know how work your multi pass system.

My guess is that osg draw your first  pass #1 - draw original with a little
offset, then transparency pass, then pass #2 - draw tinted.
You can use osg::StateSet::RenderingHint(osg::StateSet::TRANSPARENT_BIN) in
your transparency stateSet
this will tell to osg that your geometry is transparency and have to be
draw after other drawable and from front to back order

Take a look to osg::StateSet::setRenderBinDetails and osgUtil::RenderBin
and how all of this work.

HTH
David


2013/9/25 Florian Kolbe florian.ko...@in-gmbh.de

 Hi,

 1. for transparent walls we use our own node (derived from Effect) - see
 code below
 2. for tinting objects, we also use an effect node derived from Effect
 - see code below

 Used by themselves, everything works fine. But if we have a tinted
 object behind a transparent object, the tinting effect is gone (see
 screenshot).

 Code for transparency effect:

 Code:
 void define_passes()
 {
 // implement pass #1
 {
 // s.a. http://www.mail-archive.com//msg13796.html
 osg::ref_ptrosg::StateSet stateSet = new osg::StateSet;

 // mat
 osg::Material* mat = new osg::Material;
 mat-setAlpha(osg::Material::FRONT_AND_BACK, alpha);
 stateSet-setAttributeAndModes(mat,
 osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);

 // backface culling, führt dazu dass innere Rückseiten
 nicht angezeigt werden
 osg::CullFace* cull = new osg::CullFace();
 cull-setMode(osg::CullFace::BACK);
 stateSet-setAttributeAndModes(cull,
 osg::StateAttribute::ON);

 // turn on blending
 osg::BlendFunc* bf = new
 osg::BlendFunc(osg::BlendFunc::SRC_ALPHA,
 osg::BlendFunc::ONE_MINUS_SRC_ALPHA );
 stateSet-setMode(GL_BLEND, osg::StateAttribute::ON |
 osg::StateAttribute::OVERRIDE);
 stateSet-setAttributeAndModes(bf);
 // rendering hints
 stateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
 // lighting
 stateSet-setMode(GL_LIGHTING, osg::StateAttribute::OFF);

 addPass(stateSet.get());
 }
 }



 Code for coloring effect:

 Code:
 void define_passes()
 {
 // implement pass #1 - draw original with a little offset
 {
 osg::ref_ptrosg::StateSet ss = new osg::StateSet;

 osg::ref_ptrosg::PolygonOffset polyoffset = new
 osg::PolygonOffset;
 polyoffset-setFactor(1.0f);
 polyoffset-setUnits(1.0f);
 ss-setAttributeAndModes(polyoffset.get(),
 osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

 addPass(ss.get());
 }
 // implement pass #2 - draw tinted
 {
 osg::ref_ptrosg::StateSet ss = new osg::StateSet;
 // Material überschreiben
 ss-setAttributeAndModes(_wf_mat.get(),
 osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

 // notwendig, damit alpha greift

 ss-setMode(GL_BLEND,osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE);

 addPass(ss.get());
 }
 }



 See attached image:
 The fire extinguisher should be all yellow, but behind the transparent
 wall - it is as if it was rendered without the effect.

 I hope someone can sched some light on this issue?

 Thank you!

 Florian

 PS sorry if the code snippets come out weird, leading space for
 indentation somehow goes wrong...[/img][/code]

 --
 Read this topic online here:
 http://forum.openscenegraph.org/viewtopic.php?p=56477#56477




 Attachments:
 http://forum.openscenegraph.org//files/transparency_bug_132.png


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