Category: 9

Huzza!! I did it!

I have learned how to create a mesh from .x file format! – now I only need to apply picking and I am good to go!

// Mesh.h
#pragma once
#ifndef MESH_H
#define MESH_H

[...]

class Mesh
{
  friend class MeshInstance;
public:
  Mesh();
  ~Mesh();
  Mesh(LPCSTR fName, IDirect3DDevice9* dev);
  HRESULT Load(LPCSTR fName, IDirect3DDevice9* Dev);
  void Render();
  void Release();
private:
  IDirect3DDevice9* m_pDevice;
  ID3DXMesh* m_pMesh;
  std::vector m_textures;
  std::vector m_materials;
  D3DMATERIAL9 m_white;
};

class MeshInstance{
public: 
  MeshInstance();
  MeshInstance(Mesh* meshPtr);
  void Render();

  void SetMesh(Mesh* m) { m_pMesh = m;}
  void SetPosition(D3DXVECTOR3 p) { m_pos = p; }
  void SetRotation(D3DXVECTOR3 r) { m_rot = r; }
  void SetScale(D3DXVECTOR3 s) { m_sca = s; }

private:
  Mesh* m_pMesh;
  D3DXVECTOR3 m_pos, m_rot, m_sca;
};
#endif

// Mesh.cpp
#include "Mesh.h"

Mesh::Mesh(){
  m_pDevice = NULL;
  m_pMesh = NULL;
}

Mesh::Mesh(LPCSTR fName, IDirect3DDevice9* dev){
  m_pDevice = dev;
  m_pMesh = NULL;
  Load(fName, m_pDevice);
}

Mesh::~Mesh(){
  Release();
}

HRESULT Mesh::Load(LPCSTR fName, IDirect3DDevice9* dev){
  m_pDevice = dev;

  //Set m_white material
  m_white.Ambient = m_white.Specular = m_white.Diffuse  = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f);
  m_white.Emissive = D3DXCOLOR(0.0f, 0.0f, 0.0f, 1.0f);
  m_white.Power = 1.0f;

  Release();

  //Load new m_pMesh
  ID3DXBuffer * adjacencyBfr = NULL;
  ID3DXBuffer * materialBfr = NULL;
  DWORD noMaterials = NULL;

  if(FAILED(D3DXLoadMeshFromX(fName, D3DXMESH_MANAGED, m_pDevice,	
			      &adjacencyBfr, &materialBfr, NULL, 
			      &noMaterials, &m_pMesh)))
    return E_FAIL;

  D3DXMATERIAL *mtrls = (D3DXMATERIAL*)materialBfr->GetBufferPointer();

  for(int i=0;i< (int)noMaterials;i++){
    m_materials.push_back(mtrls[i].MatD3D);

    if(mtrls[i].pTextureFilename != NULL){
      char textureFileName[90];
      strcpy(textureFileName, "meshes/");
      strcat(textureFileName, mtrls[i].pTextureFilename);
      IDirect3DTexture9 * newTexture = NULL;
      D3DXCreateTextureFromFile(m_pDevice, textureFileName, &newTexture);			
      m_textures.push_back(newTexture);
    }
    else m_textures.push_back(NULL);
  }

  m_pMesh->OptimizeInplace(D3DXMESHOPT_ATTRSORT | D3DXMESHOPT_COMPACT | D3DXMESHOPT_VERTEXCACHE,
			   (DWORD*)adjacencyBfr->GetBufferPointer(), NULL, NULL, NULL);

  adjacencyBfr->Release();
  materialBfr->Release();

  return S_OK;
}

void Mesh::Render(){
  for(int i=0;i< (int)m_materials.size();i++) {	
    if(m_textures[i] != NULL)m_pDevice->SetMaterial(&m_white);
    else m_pDevice->SetMaterial(&m_materials[i]);
    m_pDevice->SetTexture(0,m_textures[i]);
    m_pMesh->DrawSubset(i);
  }
}

void Mesh::Release(){
  //Clear old mesh...
  if(m_pMesh != NULL){
    m_pMesh->Release();
    m_pMesh = NULL;
  }

  //Clear textures and materials
  for(int i=0;i< (int)m_textures.size();i++)
    if(m_textures[i] != NULL)
      m_textures[i]->Release();
    m_textures.clear();
}

MeshInstance::MeshInstance(){
  m_pMesh = NULL;
  m_pos = m_rot = D3DXVECTOR3(0.0f, 0.0f, 0.0f);
  m_sca = D3DXVECTOR3(1.0f, 1.0f, 1.0f);
}

MeshInstance::MeshInstance(Mesh* meshPtr){
  m_pMesh = meshPtr;
  m_pos = m_rot = D3DXVECTOR3(0.0f, 0.0f, 0.0f);
  m_sca = D3DXVECTOR3(1.0f, 1.0f, 1.0f);
}

void MeshInstance::Render(){
  if(m_pMesh != NULL){
    D3DXMATRIX p, r, s;
    D3DXMatrixTranslation(&p, m_pos.x, m_pos.y, m_pos.z);
    D3DXMatrixRotationYawPitchRoll(&r, m_rot.y, m_rot.x, m_rot.z);
    D3DXMatrixScaling(&s, m_sca.x, m_sca.y, m_sca.z);		
    D3DXMATRIX world = s * r * p;
    m_pMesh->m_pDevice->SetTransform(D3DTS_WORLD, &world);
    m_pMesh->Render();
  }
}

// ObjectClass.h
#ifndef OBJECTCLASS_H
#define OBJECTCLASS_H

[...]
#include "debug.h"
#include "mesh.h"

HRESULT LoadObjectResources(IDirect3DDevice9* Device);
void UnloadObjectResources();

#define OBJ_TREE 0
#define OBJ_STONE 1

class ObjectClass{
public:
  ObjectClass();
  ObjectClass(int t, D3DXVECTOR3 pos, D3DXVECTOR3 rot, D3DXVECTOR3 sca);
  void Render();

private:
  MeshInstance m_meshInstance;
  int m_type;
};
#endif

// ObjectClass.cpp
#include "ObjectClass.h"

std::vector objectMeshes;

HRESULT LoadObjectResources(IDirect3DDevice9* device){
  Mesh* one = new Mesh("meshes/one.x", device);
  objectMeshes.push_back(one);
  Mesh* two= new Mesh("meshes/two.x", device);
  objectMeshes.push_back(two);
  return S_OK;
}

void UnloadObjectResources(){
  for(int i=0; i< (int)objectMeshes.size(); i++)
    objectMeshes[i]->Release();
  objectMeshes.clear();
}

ObjectClass::ObjectClass(){
  m_type =0;
}

ObjectClass::ObjectClass(int t, D3DXVECTOR3 pos, D3DXVECTOR3 rot, D3DXVECTOR3 sca){
  m_type = t;
  m_meshInstance.SetPosition(pos);
  m_meshInstance.SetRotation(rot);
  m_meshInstance.SetScale(sca);
  m_meshInstance.SetMesh(objectMeshes[m_type]);
}

void ObjectClass::Render(){
  m_meshInstance.Render();
}

usage is really simple:

in our main program class game/application/app you name it.

we need to add include

#include "ObjectClass.h"

then in Init method for your program place

  LoadObjectResources(m_pDevice); 

it is loading resources do our device.

to add object call

  AddObject(0, INTPOINT(x, y));	//objec one
  else if(m_pHeightMap->GetHeight(x, y) >= 1.0f && hm3.GetHeight(x, y) > 0.9f && rand()%20 == 0)
    AddObject(1, INTPOINT(x, y));	//object two

I am calling it in terrain class.

at the moment placed randomly

void Terrain::AddObject(int type, INTPOINT mappos)
{
  D3DXVECTOR3 pos = D3DXVECTOR3((float)mappos.x, m_pHeightMap->GetHeight(mappos), (float)-mappos.y);	
  D3DXVECTOR3 rot = D3DXVECTOR3((rand()%1000 / 1000.0f) * 0.13f, (rand()%1000 / 1000.0f) * 3.0f, (rand()%1000 / 1000.0f) * 0.13f);

  float sca_xz = (rand()%1000 / 1000.0f) * 0.5f + 0.5f;
  float sca_y = (rand()%1000 / 1000.0f) * 1.0f + 0.5f;
  D3DXVECTOR3 sca = D3DXVECTOR3(sca_xz, sca_y, sca_xz);

  m_objects.push_back(ObjectClass(type, pos, rot, sca));
}

374 FPS not bad!