Hi,
I'm trying to get a model lit, but it isn't working. The following pic shows the model in two phases of its rotation, one appears black, the other affected by the light... i guess:
this is what I'm doing:
void SetupLights()
{
D3DMATERIAL9 mtrl;
ZeroMemory( &mtrl, sizeof(D3DMATERIAL9) );
mtrl.Diffuse.r = 1.0f;
mtrl.Diffuse.g = 0.5f;
mtrl.Diffuse.b = 0.0f;
mtrl.Diffuse.a = 1.0f;
g_pd3dDevice->SetMaterial( &mtrl );
D3DLIGHT9 light;
ZeroMemory( &light, sizeof(D3DLIGHT9) );
light.Type = D3DLIGHT_DIRECTIONAL;
light.Diffuse.r = 1.0f;
light.Diffuse.g = 1.0f;
light.Diffuse.b = 1.0f;
light.Direction.x = 2.0f;
light.Direction.y = 30.0f;
light.Direction.z = -30.0f;
light.Range = 1000.0f;
g_pd3dDevice->SetLight( 0, &light );
g_pd3dDevice->LightEnable( 0, TRUE );
}
void Render()
{
if(g_pd3dDevice == NULL)
return;
g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(234, 234, 234), 1.0f, 0);
g_pd3dDevice->BeginScene();
SetupLights();
SetupMatrices();
mdx->BuildNormals();
g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(Vertex));
g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
g_pd3dDevice->SetIndices(g_pIB);
g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, mdx->m_pMeshes[0].m_iNumVerts, 0, mdx->m_pMeshes[0].m_iNumFaces);
g_pd3dDevice->EndScene();
g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
}
and here is the BuildNormals method:
void CMdx::BuildNormals()
{
for (int i = 0; i < m_iNumMeshes; i++)
{
Mesh &mesh = m_pMeshes;
for (int j = 0; j < mesh.m_iNumVerts; j++)
{
mesh.m_pVert[j].normal.x = 0;
mesh.m_pVert[j].normal.y = 0;
mesh.m_pVert[j].normal.z = 0;
}
for (int j = 0; j < mesh.m_iNumFaces; j++)
{
Face &tri = mesh.m_pFace[j];
Vertex &v0 = mesh.m_pVert[tri.vertIndex[0]];
Vertex &v1 = mesh.m_pVert[tri.vertIndex[1]];
Vertex &v2 = mesh.m_pVert[tri.vertIndex[2]];
float Ax = v1.position.x - v0.position.x;
float Ay = v1.position.y - v0.position.y;
float Az = v1.position.z - v0.position.z;
float Bx = v2.position.x - v0.position.x;
float By = v2.position.y - v0.position.y;
float Bz = v2.position.z - v0.position.z;
float nx = Ay * Bz - By * Az;
float ny = -(Ax * Bz - Bx * Az);
float nz = Ax * By - Bx * Ay;
v0.normal.x += nx;
v0.normal.y += ny;
v0.normal.z += nz;
v1.normal.x += nx;
v1.normal.y += ny;
v1.normal.z += nz;
v2.normal.x += nx;
v2.normal.y += ny;
v2.normal.z += nz;
}
for (int j = 0; j < mesh.m_iNumVerts; j++)
{
Vertex &v = mesh.m_pVert[j];
float len = float(sqrt(v.normal.x * v.normal.x + v.normal.y * v.normal.y + v.normal.z * v.normal.z));
if (len)
{
v.normal.x /= len;
v.normal.y /= len;
v.normal.z /= len;
}
}
}
}
Any help?
