Graphics Programming in 3D - Essentials of Interactive Computer Graphics - page 432

class UWBD3D _ MeshResource : public UWBD3D _ Resource {
public :

A:

void DrawMesh( ... ); // Render the mesh with D3D

.

const UWB _ BoundingBox * GetBoundingBox();

B:

// Bounds of the mesh object

.
protected :

C: bool LoadResourceFromFile(fullPathName); // Loading the .x mesh file

.

LPD3DXMESH m _ Mesh; // D3D-specific mesh storage
UWB _ Array<D3DMATERIAL9> m _ MeshMaterials; // Materials defined in the .x file
UWB _ Array<LPDIRECT3DTEXTURE9> m _ MeshTextures;

D:

// Textures defined in the .x file

.
UWB _ BoundingBox m _ bounds; // Bounds of the mesh object

bool UWBD3D _ MeshResource::LoadResourceFromFile( const wchar _ t * fullPathName) {
// Loads .x file (fullPathName) into m _ Mesh

D3DXLoadMeshFromX(fullPathName, ... m _ Mesh) E:

Source file.
uwbgl _ D3DMeshResource1.h
file in the D3D Files/
D3D_Resources

. // if defined, loads file textures into m _ MeshTextures
// Computes m _ bound of the mesh object

subfolder

UWBGL _ D3D _ Lib15

of the

project.

D3DXComputeBoundingBox(... m _ Mesh->GetNumVertices() )
.

F:

Listing 16.2. Support for mesh file resource.

will work with D3D to render the geometry defined in a .x mesh file. At label B,
proper bound information is maintained for the mesh geometry to support col-
lision computations (to be discussed in Section 16.6). The LoadResoruceFrom
File() function at label C will load the mesh file specified by fullPathName into
D3D. At label D, LPD3DXMESH is the D3D-specific representation for storing mesh
geometries, and the D3DMATERIAL9 and DIRECT3DTEXTURE9 arrays are defined to
store the material properties and (potential) file textures defined for the mesh ob-
ject. Label E shows the implementation of the LoadResourceFromFile() func-
tion where the mesh file is loaded into the LPD3DXMESH internal structure by the
D3DXLoadMeshFromX() function. Label F shows that we, as programmers, are
responsible for computing the bounds of a mesh object.