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dbMakeObjectGroundPlane (b, 30.0f, 30.0f); //dbMakeObjectPlane() analog
dbTextureObject  (b,w);
dbSetObjectLight (b, 0);
dbSetObjectTexture (b, 2, 1); //not necessary
dbGhostObjectOn  (b, 0);
dbDisableObjectZWrite(b);

float4 PixelShader(vs_in IN) {
    // Sample our texture and return its interpolated colour value at the given texture coordinates and
    // set its alpha value to always be 0.5.
    // Of course the actual alpha value can be set to a constant float that you can set from your DarkGDK application or
    // some other type of input.
    return float4(tex2D(sampler, IN.uv).rgb, 0.5);
}

void setObjectAlpha(int objId, unsigned char alpha)
{
    dbLockVertexdataForLimb(objID, 0)
        for(int i = 0; i != dbGetVertexdataVertexCount(); ++i)
        {
            unsigned long rgb = dbGetVertexdataDiffuse(i) & 0x00FFFFFF;
            dbSetVertexdataDiffuse(rgb | (alpha<<24));
        }
    dbUnlockVertexdata();
}

void SetObjectAlpha (int objID, unsigned char alpha)
{
	dbLockVertexdataForLimb (objID,0);
	for (int i=0; i!=dbGetVertexdataVertexCount(); ++i)
	{	unsigned long rgb = dbGetVertexdataDiffuse(i) & 0x00FFFFFF;
		dbSetVertexdataDiffuse(rgb | (alpha<<24));
	}
	dbUnlockVertexdata();
}

function set_object_alpha(objID, alpha)
    lock vertexdata for limb objID, 0
        for i = 0 to get vertexdata vertex count()-1
            rgb = get vertexdata diffuse(i) && 0x00FFFFFF
            set vertexdata diffuse i, rgb || (alpha << 24)
        next i
    unlock vertexdata
endfunction

dbConvertObjectFVF (b, 338);
dbSetObjectLight (b, 0);
dbGhostObjectOn  (b, 0);
dbDisableObjectZWrite(b);
dbFadeObject (b,50.0f); // 50%

dbConvertObjectFVF (b, 0x040); //from DarkGDK's HELP: FVF_DIFFUSE=0x040 (D3DFVF_DIFFUSE)
dbSetObjectLight (b, 0);
dbGhostObjectOn  (b, 0);
dbDisableObjectZWrite(b);
SetObjectAlpha (b,128); // 50%

...where:
void SetObjectAlpha (int objID, unsigned char alpha)
{
	dbLockVertexDataForLimb (objID,0);
	for (int i=0; i!=dbGetVertexDataVertexCount(); ++i)
	{	unsigned long rgb = dbGetVertexDataDiffuse(i) & 0x00FFFFFF;
		dbSetVertexDataDiffuse(i, rgb | (alpha<<24));
	}
	dbUnlockVertexData();
}

DARKSDK_DLL void SetDiffuse	( sMesh* pMesh, float fPercentage )
{
	// get the offset map for the FVF
	sOffsetMap offsetMap;
	GetFVFOffsetMap ( pMesh, &offsetMap );

	// make sure we have data in the vertices
	if ( pMesh->dwFVF & D3DFVF_DIFFUSE )
	{
		// calculate an RGB from iPercentage
		DWORD dwColor = (DWORD)(fPercentage*255);
		DWORD dwRGB = D3DCOLOR_ARGB ( dwColor, dwColor, dwColor, dwColor ); // s_i !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! s_i
		SetDiffuseEx ( pMesh, dwRGB );
	}
	else
	{
		// else apply diffuse to material and activate
		pMesh->bUsesMaterial=true;
		pMesh->mMaterial.Diffuse.r = fPercentage;
		pMesh->mMaterial.Diffuse.g = fPercentage;
		pMesh->mMaterial.Diffuse.b = fPercentage;
		pMesh->mMaterial.Diffuse.a = 1.0f;
		pMesh->mMaterial.Ambient.r = fPercentage;
		pMesh->mMaterial.Ambient.g = fPercentage;
		pMesh->mMaterial.Ambient.b = fPercentage;
		pMesh->mMaterial.Ambient.a = 1.0f;
		pMesh->mMaterial.Specular.r = 0.0f;
		pMesh->mMaterial.Specular.g = 0.0f;
		pMesh->mMaterial.Specular.b = 0.0f;
		pMesh->mMaterial.Specular.a = 0.0f;
		pMesh->mMaterial.Emissive.r = 0.0f;
		pMesh->mMaterial.Emissive.g = 0.0f;
		pMesh->mMaterial.Emissive.b = 0.0f;
		pMesh->mMaterial.Emissive.a = 0.0f;
	}
}

DARKSDK_DLL void SetDiffuseEx ( sMesh* pMesh, DWORD dwRGB )
{
	// get the offset map for the FVF
	sOffsetMap offsetMap;
	GetFVFOffsetMap ( pMesh, &offsetMap );

	// make sure we have data in the vertices
	if ( pMesh->dwFVF & D3DFVF_DIFFUSE )
	{
		// go through all of the vertices
		for ( int iCurrentVertex = 0; iCurrentVertex < (int)pMesh->dwVertexCount; iCurrentVertex++ )
		{
			// dwDiffuse = RGB
			*( ( DWORD* ) pMesh->pVertexData + offsetMap.dwDiffuse + ( offsetMap.dwSize * iCurrentVertex ) ) = dwRGB;
		}
	}

	// flag mesh for a VB update
	pMesh->bVBRefreshRequired=true;
}