地形纹理混合问题
我的问题如下
我有四张纹理图，分四次进行渲染，然后得到了四层纹理的混合的地形效果。现在我需要加上第五层渲染，这层渲染得功能 是让我拾取的地形三角形显示为红色。我先在第五层渲染得时候选择漫反射颜色为红色，但是实际效果上，并没有显示红色，而是 根据漫反射颜色的alpha通道的值进行了透明处理，如果这个值为ff就是纯黑色，不知道是什么问题，我把主要代码放在下面了
device->SetTexture(0, Tex_1); device->SetRenderState( D3DRS_ALPHABLENDENABLE,TRUE); device->SetRenderState( D3DRS_SRCBLEND,D3DBLEND_SRCALPHA); device->SetRenderState( D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA); device->SetTextureStageState( 0, D3DTSS_TEXCOORDINDEX,0); device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE ); device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 ); //device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTA_DIFFUSE ); device->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_DIFFUSE ); device->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_SELECTARG1 ); device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0,rowidth*colheight,0,(rowidth-1)*(colheight-1)*2); device->SetTexture(0, Tex_2); device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE ); device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 ); device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0,rowidth*colheight,0,(rowidth-1)*(colheight-1)*2); device->SetTexture(0, Tex_3); device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE ); device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 ); device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0,rowidth*colheight,0,(rowidth-1)*(colheight-1)*2); device->SetTexture(0, Tex_4); device->SetTextureStageState(0, D3DTSS_TEXCOORDINDEX, 0); device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE ); device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 ); device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0,rowidth*colheight,0,(rowidth-1)*(colheight-1)*2); MyTr->Lock(0,0,(void **) &mymap,0); for (int i =0;i<64*64;i++){ //mymap[i]._color=(diffusevt[i]<<24); mymap[i]._color=0xccff0000; } MyTr->Unlock(); device->SetTexture(0, Tex_4); device->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_DIFFUSE ); device->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 ); device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0,rowidth*colheight,0,(rowidth-1)*(colheight-1)*2);