polyvox integration to irrlicht

granyte · **Joined:** Sat Mar 26, 2011 6:41 pm **Posts:** 8

hey everyy one i'm trying to integrate polyvox with irrlicht and thus possibly later in my game engine also

and it seem that polyvex provide a convinient and esy way to acces the vertices and indices of a generated mesh

how ever i have no idea how the data is formated withing the returned vector and thus i'm having a hard time integrating it into irrlicht

whos vertices are defined as follow

Vertices[0] = video::S3DVertex(x,y,z, nx,ny,nz,video::SColor(255,0,255,255), 0, 1);

how shouldi go to get the data to go from one to the other?

DefiniteIntegral · **Joined:** Sun Jan 23, 2011 6:06 am **Posts:** 92

Something like this I would think....

Code:

void convertMesh(PolyVox::SurfaceMesh<PolyVox::PositionMaterialNormal>* mesh)
{
   const std::vector<uint32_t>& indices = mesh->getIndices();
   const std::vector<PolyVox::PositionMaterialNormal>& vertices = mesh->getVertices();
   
   for(uint32_t v = 0 ; v < mesh->getNoOfVertices() ; v++)
   {
      const PolyVox::Vector3DFloat& position = vertices[v].getPosition();
      const PolyVox::Vector3DFloat& normal = vertices[v].getNormal();
      
      float posX = position.getX();   // .. and so on

   }
   
   for(uint32_t i = 0 ; i < mesh->getNoOfIndices(); i++)
   {
      // ! copy indices or whatever
   }
}

David Williams · **Joined:** Sun May 04, 2008 6:35 pm **Posts:** 1827

Which surface extractor do you want to use? The easiest one to start with is probably the CubicSurfaceExtratorWithNormals. In this case the vertex data is in the format defined by the PositionMaterialNormal class, which you can see here: VertexTypes.h.

PolyVox will provide the position and the normal which you can use with Irrlicht's S3DVertex class. For the colour and texture coordinates you will just have to fill in dummy values. We can look at how to use materials once you have the basic mesh displaying.

granyte · **Joined:** Sat Mar 26, 2011 6:41 pm **Posts:** 8

idealy i'd prefer to use a smooth mesh extractor

but anyway rightnow when i try to setup a mesh extractor i get

error argument list for class template "PolyVox::SurfaceMesh" is missing

anything i'm doing wrong

or includes i could have missed?

EDIT BTW thanks for the conversion code it makes sens

David Williams · **Joined:** Sun May 04, 2008 6:35 pm **Posts:** 1827

The smooth SurfaceExtractor and the CubicSurfaceExtractorWithNormals are basically interchangeable so no problems there. But really we need to see code to identify the problem. Have you taken a look at the BasicExample, and does that work for you?

And be sure to read this tutorial if your not yet familier with the basics: http://www.thermite3d.org/resources/documentation/polyvox/documentation/tutorial1.html

granyte · **Joined:** Sat Mar 26, 2011 6:41 pm **Posts:** 8

that's the code of this tutorial i'm trying to use

and as i said the tutorial say only mention required headers i'm suposed to guess them?

also just copy pasting the code result in an error when trying to create surfacemesh object mesh (yes i have surfacemesh.h included i guessed that one)

DefiniteIntegral · **Joined:** Sun Jan 23, 2011 6:06 am **Posts:** 92

The headers aren't hard to figure out. Generally each class has it's own header.

Have a look at the API documentation: http://www.thermite3d.org/resources/doc ... tated.html

Also take a look at the Basic and OpenGL example code with PolyVox. Those definitely do compile.

David Williams · **Joined:** Sun May 04, 2008 6:35 pm **Posts:** 1827

I've just checked and I can see the tutorial is out of date and does not compile. The actual compiling code is in the BasicExample (see here) which comes as part of PolyVox. You should use the tutorial for the information but the BasicExample for the actual code.

The BasicExample includes the following headers:

Code:

#include "MaterialDensityPair.h"
#include "CubicSurfaceExtractorWithNormals.h"
#include "SurfaceMesh.h"
#include "Volume.h" 

Sorry the documentation is out of date but this library is not finished yet... hopefully we'll update it soon

granyte · **Joined:** Sat Mar 26, 2011 6:41 pm **Posts:** 8

thank's for pointing me in the right direction again

however this code now break the conversion code

saying that mesh must have a pointer type

David Williams · **Joined:** Sun May 04, 2008 6:35 pm **Posts:** 1827

You're referring to DefiniteIntegral's convertMesh() function above? It takes a pointer to a mesh, so you probably need to do something like:

Code:

convertMesh(&mesh);

(note the '&' before 'mesh'). If that doesn't answer your question you'll need to show your actual code.

polyvox integration to irrlicht

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