[osg-users] problem in mipmap

[冯晨]

 
 
 Hi,
   I've met a very strange problem when I tried to set mipmaps in a osg::Image 
object.
   If I use the sample code in osgParticle/PrecipitationEffect.cpp, I can get 
correct mipmap texture, however, if I try to read texture data from files to 
set mipmap texture, it didn't work. I'll be mad, somebody met this problem 
before? help~~
 
p.s.
   sample code(texturemipmaps.cpp) : change from 
osgParticle/PrecipitationEffect.cpp and work well
   my code(Mymipmap.cpp):  could not work appropriately, with no texture on 
that plane..

 #include osg/MatrixTransform
#include osg/PositionAttitudeTransform
#include osg/Texture2D
#include osg/Geometry
#include osg/Geode
#include osgDB/Registry
#include osgDB/ReadFile
#include osgViewer/Viewer

osg::ref_ptrosg::Geometry createPlane( float length, float width )
{
osg::ref_ptrosg::Vec3Array vec = new osg::Vec3Array;
vec-resize( 8 );
(*vec)[0] = osg::Vec3f(  -2, 0, -2 );
(*vec)[1] = osg::Vec3f( -2, 0, 2 );
(*vec)[2] = osg::Vec3f( 2, 0, 2 );
(*vec)[3] = osg::Vec3f( 2, 0, -2 );

osg::ref_ptrosg::Vec3Array nor = new osg::Vec3Array;
nor-push_back( osg::Vec3f( 0.0, -1.0, 0.0 ) );

osg::ref_ptrosg::Vec2Array tex = new osg::Vec2Array;
tex-push_back( osg::Vec2f(0.0, 0.0) );
tex-push_back( osg::Vec2f(0.0, 1.0) );
tex-push_back( osg::Vec2f(1.0, 1.0) );
tex-push_back( osg::Vec2f(1.0, 0.0) );

osg::ref_ptrosg::Geometry geo = new osg::Geometry;
geo-setVertexArray( vec.get() );
geo-setTexCoordArray( 0, tex.get() );
geo-setNormalArray( nor.get() );
geo-setNormalBinding( osg::Geometry::BIND_PER_PRIMITIVE_SET );
geo-addPrimitiveSet( new osg::DrawArrays( osg::PrimitiveSet::QUADS, 0, 
4 ) );

return geo;
}

static void fillSpotLightImage(unsigned char* ptr, const osg::Vec4 
centerColour, const osg::Vec4 backgroudColour, unsigned int size, float power)
{
if (size==1)
{
float r = 0.5f;
osg::Vec4 color = centerColour*r+backgroudColour*(1.0f-r);
*ptr++ = (unsigned char)((color[0])*255.0f);
*ptr++ = (unsigned char)((color[1])*255.0f);
*ptr++ = (unsigned char)((color[2])*255.0f);
*ptr++ = (unsigned char)((color[3])*255.0f);
return;
}

float mid = (float(size)-1.0f)*0.5f;
float div = 2.0f/float(size);
for(unsigned int r=0;rsize;++r)
{
//unsigned char* ptr = image-data(0,r,0);
for(unsigned int c=0;csize;++c)
{
float dx = (float(c) - mid)*div;
float dy = (float(r) - mid)*div;
float r = powf(1.0f-sqrtf(dx*dx+dy*dy),power);
if (r0.0f) r=0.0f;
osg::Vec4 color = 
centerColour*r+backgroudColour*(1.0f-r);
*ptr++ = (unsigned char)((color[0])*255.0f);
*ptr++ = (unsigned char)((color[1])*255.0f);
*ptr++ = (unsigned char)((color[2])*255.0f);
*ptr++ = (unsigned char)((color[3])*255.0f);
}
}
}

int main(int, char **)
{
osgViewer::Viewer viewer;
osg::ref_ptrosg::Group root = new osg::Group;
osg::ref_ptrosg::PositionAttitudeTransform mypat1 = new 
osg::PositionAttitudeTransform;
osg::ref_ptrosg::PositionAttitudeTransform mypat2 = new 
osg::PositionAttitudeTransform;
osg::ref_ptrosg::Geode mygeode1 = new osg::Geode;
osg::ref_ptrosg::Geode mygeode2 = new osg::Geode;

osg::StateSet* mystate0 = root-getOrCreateStateSet();
osg::StateSet* mystate1 = mypat1-getOrCreateStateSet();

osg::Image* image = new osg::Image;
osg::Image::MipmapDataType mipmapData;
unsigned int s = 32;
unsigned int totalSize = 0;
unsigned i;
for(i=0; s0; s=1, ++i)
{
if (i0) mipmapData.push_back(totalSize);
totalSize += s*s*4;
}

unsigned char* ptr = new unsigned char[totalSize];
image-setImage(32, 32, 32, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, ptr, 
osg::Image::USE_NEW_DELETE,1);

image-setMipmapLevels(mipmapData);

s = 32;
for(i=0; s0; s=1, ++i)
{
fillSpotLightImage(ptr, osg::Vec4(1.0f,1.0f,1.0f,1.0f), 
osg::Vec4(1.0f,0.1f*s,1.0f/s,1.0f), s, 1.0);
ptr += s*s*4;
}

osg::Texture2D* mytex1 = new osg::Texture2D;
mytex1-setImage( 0, image );
mytex1-setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
mytex1-setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
mytex1-setFilter(osg::Texture::MIN_FILTER, 
osg::Texture::NEAREST_MIPMAP_NEAREST);
mytex1-setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);

Re: [osg-users] Extract an embedded texture from an .ive

[冯晨]

 
 
 Hi，
I've also been doing the same thing lately. I've writen some code to 
achieve that, maybe help, :)

class TextureVisitor : public osg::NodeVisitor
{
public:
TextureVisitor(int sizelimit, int levelnum):_sizelimit(sizelimit), 
_levelnum(levelnum),
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
{}

virtual void apply(osg::Group node)
{
osg::StateSet* ss = node.getStateSet();
if(ss!=NULL)
traverseTexture(ss);
traverse(node);
}

virtual void apply(osg::Node node)
{
osg::StateSet* ss = node.getStateSet();
if(ss!=NULL)
traverseTexture(ss);
traverse(node);
}

virtual void apply(osg::Geode node)
{
osg::StateSet* ss = node.getStateSet();
if(ss!=NULL)
traverseTexture(ss);

int numdrawables = node.getNumDrawables();
for(int i=0; inumdrawables; ++i)
{
ss = node.getDrawable(i)-getStateSet();
if(ss!=NULL)
traverseTexture(ss);
}
traverse(node);
}

void traverseTexture(osg::StateSet* ss)
{
osg::StateSet::TextureAttributeList texAbl =
ss-getTextureAttributeList();
int i=0;
for(osg::StateAttribute* sa = ss-getTextureAttribute(i, 
osg::StateAttribute::TEXTURE);
itexAbl.size(); ++i)
{
osg::Texture2D* tex2d = dynamic_castosg::Texture2D*(sa);
if(tex2d==NULL)
continue;
//对于每一个image
int numImg = tex2d-getNumImages();
for(int j=0; jnumImg; ++j)
{
osg::Image* img = tex2d-getImage(j);
SaveTexture(img);
}
}
}
string getName(const string filename)
{
string::size_type pos = filename.find_last_of(\\);
string::size_type pointpos = filename.find_last_of(.);
string name;
for(string::size_type i = pos+1; ipointpos; ++i)
{
name += filename[i];
}
return name;
}
void SaveTexture(osg::Image* img)
{
osgDB::writeImageFile(img, img-getFileName());
}
private:
int _sizelimit;
int _levelnum;
};

 


在2008-07-09 21:32:46，Doug [EMAIL PROTECTED] 写道：
Hi,

I have a model in .ive format with an embedded texture. I need to bring 
the model into 3dsMax to work on it. I can use osgconv to convert it to 
one of several different formats that Max can import (obj, dae, etc.), 
but I also need the texture that is embedded. Can anyone point me in the 
right direction as to how to extract a texture that is embedded in an 
.ive file?

Thanks,

Doug
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Re: [osg-users] osg::Texture and stateSets

[冯晨]

 
 
 Hi,
I think osgUtil::optimizer::TextureVisitor should solve your problem:)
Good luck.


 

在2008-07-09 22:53:21，ka Ming [EMAIL PROTECTED] 写道：

Hi,
I got a Probel with osg Files, the File structure looks like:
Group{
Geode{
Geometry{
StateSet{
Texture{
}
}
}
}
Geode{
Geometry{
StateSet{
Texture{
}
}
}
}
}
The problem is if I try to traverse my SceneGraph I get the names of my geodes, 
but if I check the TextureAttributeList
osg::StateSet::TextureAttributeList texAttrList = stateSet- 
getTextureAttributeList();
this list is empty. Why is this List empty, did I forget something? I want to 
access all Textures!!
Thanks
Ming




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