D3D 物体在镜子、阴影中怎样同步透明?物体渐变透明过程怎样消除挡住镜中物体的情况?

来源：学生作业帮编辑：拍题作业网作业帮分类：综合作业时间：2024/04/30 11:28:59

D3D 物体在镜子、阴影中怎样同步透明?物体渐变透明过程怎样消除挡住镜中物体的情况?
.以下是shadow函数代码,实现透明的时候只捕获了一次变透明按键消息,放开按键又回到原来状态,物体透明了影子还在……何解呀大师前辈们?
void RenderShadow(float timeDelta)
{
Device->SetRenderState(D3DRS_STENCILENABLE,true);
Device->SetRenderState(D3DRS_STENCILFUNC,D3DCMP_EQUAL);
Device->SetRenderState(D3DRS_STENCILREF,0x0);
Device->SetRenderState(D3DRS_STENCILMASK,0xffffffff);
Device->SetRenderState(D3DRS_STENCILWRITEMASK,0xffffffff);
Device->SetRenderState(D3DRS_STENCILZFAIL,D3DSTENCILOP_KEEP);
Device->SetRenderState(D3DRS_STENCILFAIL,D3DSTENCILOP_KEEP);
Device->SetRenderState(D3DRS_STENCILPASS,D3DSTENCILOP_INCR); // increment to 1
// position shadow
D3DXVECTOR4 lightDirection(0.707f,-0.707f,0.707f,0.0f);
D3DXPLANE groundPlane(0.0f,-1.0f,0.0f,0.0f);
D3DXMATRIX S;
D3DXMatrixShadow(
&S,
&lightDirection,
&groundPlane);
D3DXMATRIX T;
D3DXMatrixTranslation(
&T,
TeapotPosition.x,
TeapotPosition.y,
TeapotPosition.z);
D3DXMATRIX yRot;
// D3DXMATRIX xRot;
static float y = 0.0f;
D3DXMatrixRotationY(&yRot,y);
if( ::GetAsyncKeyState(VK_LEFT) & 0x8000f )
y+=5* timeDelta;
if( ::GetAsyncKeyState(VK_RIGHT) & 0x8000f )
y-=5* timeDelta;
if( y>= 6.28f)
y= 0.0f;
D3DXMATRIX W = yRot*T * S;
Device->SetTransform(D3DTS_WORLD,&W);
// alpha blend the shadow
Device->SetRenderState(D3DRS_ALPHABLENDENABLE,true);
Device->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);
Device->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);
D3DMATERIAL9 mtrl = d3d::InitMtrl(d3d::BLACK,d3d::BLACK,d3d::BLACK,d3d::BLACK,0.0f);
mtrl.Diffuse.a = 0.6f; // 50% transparency.
if( ::GetAsyncKeyState('A') & 0x8000f )
//{angle -= 1.2f * timeDelta;
mtrl.Diffuse.a += 0.1f;
if( ::GetAsyncKeyState('S') & 0x8000f )
mtrl.Diffuse.a -= 0.1f;
if(mtrl.Diffuse.a > 1.0f)
mtrl.Diffuse.a = 1.0f;
if(mtrl.Diffuse.a < 0.0f)
mtrl.Diffuse.a = 0.0f;
// Disable depth buffer so that z-fighting doesn't occur when we
// render the shadow on top of the floor.
Device->SetRenderState(D3DRS_ZENABLE,false);
Device->SetMaterial(&mtrl);
Device->SetTexture(0,0);
Teapot->DrawSubset(0);
Device->SetRenderState(D3DRS_ZENABLE,true);
Device->SetRenderState(D3DRS_ALPHABLENDENABLE,false);
Device->SetRenderState(D3DRS_STENCILENABLE,false);
};

(╯﹏╰)b...
求同解……

为什么光可以在透明物体中传播光在透明物体中会反射吗为什么光能在透明物体中传播,却不能在不透明物体中传播? 如何在3D Max中画外层透明,里面可以看到其他物体的图如何拍摄透明物体透明物体反射光吗? 透明物体的现象光能穿透透明物体,光在物体中究竟发生了什么?为什么某些波长较大的电磁波和波长较小的紫外区能穿透而可见光不行不透明物体和透明物体对光的吸收和反射的情况在测出物体质量为137.6g的过程中,加减砝码的过程怎样? 物体在空中以9.8m/s2的加速度下降,则运动过程中物体的机械能会怎样有检测透明物体的光电开关吗? 如何拍摄透明物体的全息照片