hello

I have found a defect in rendering a model in directx9,the defect is illustrated by the following attach files.when I rotate the model,the defect disappeared.I enabled the depth testing and lighting.here is my code.

[attachment=13974:???.jpg],

D3DLIGHT9 light; // create the light struct
D3DMATERIAL9 material; // create the material struct
DefaultMaterial::getMaterial(material,JADE);
ZeroMemory(&light, sizeof(light)); // clear out the light struct for use
light.Type = D3DLIGHT_DIRECTIONAL; // make the light type 'directional light'
light.Diffuse =material.Diffuse ;
light.Ambient=material.Ambient ;
light.Specular=material.Specular ;
light.Direction = D3DXVECTOR3(-1.0f, -0.3f, -1.0f);

m_pDevice->SetLight(0, &light); // send the light struct properties to light #0
m_pDevice->LightEnable(0, TRUE); // turn on light #0

m_pDevice->SetMaterial(&material); // set the globably-used material to &material

r=m_pDevice->SetRenderState(D3DRS_LIGHTING, TRUE); // turn on the 3D lighting
r=m_pDevice->SetRenderState(D3DRS_ZENABLE, TRUE); // turn on the z-buffer
r=m_pDevice->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_XRGB(250, 250, 250)); // ambient light
m_pDevice->SetRenderState(D3DRS_ZFUNC,D3DCMP_LESS);
m_pDevice->SetRenderState(D3DRS_ZWRITEENABLE,true);

Does that mean I'm doing something wrong?Thanks for the help!

Yes, you're not using the programmable pipeline.

Yup, looks like Z-Fighting to me. Here's an article which helps explain how to fix it using various methods and render states: http://software.intel.com/en-us/articles/alternatives-to-using-z-bias-to-fix-z-fighting-issues

I'm going to assume you're using D3DFMT_D24S8 as your depth buffer format. If you're using D3DFMT_D16, then you're more likely to get Z-Fighting artifacts.

Shogun.

Thanks for the tip.I changed D3DFMT_D16 to D3DFMT_D24X8; it works very well.

thanks!