rollout rolTest "Sel Back Faces"
(
 
-- Filter Functions ------------------------------------------------------------
 
    function filterObj item = ( ((classOf item) == Editable_Poly) or ((classOf item) == Editable_Mesh) )
 
    function filterCamera item = ((superClassOf item) == Camera)
 
-- Interface -------------------------------------------------------------------
 
    pickButton pbtObj "Object" message:"Pick an Editable Poly or Editable Mesh" filter:filterObj autoDisplay:true width:90 height:16 align:#left offset:[-6, 14] toolTip:"Editable Poly / Mesh"
    pickButton pbtCamera "Camera" message:"Pick a Camera" filter:filterCamera autoDisplay:true width:90 height:16 align:#left offset:[-6, -2] toolTip:"Camera"
    groupBox gbxNodes " Nodes " width:98 height:56 align:#left offset:[-10, -56]
 
    label lbFrameA "From" align:#left offset:[-4, 15] across:2
    spinner spFrameA range:[-99999, 99999, 0] type:#integer fieldWidth:45 align:#left offset:[-11, 14]
    label lbFrameZ "To" align:#left offset:[-4, -1] across:2
    spinner spFrameZ range:[-99999, 99999, 100] type:#integer fieldWidth:45 align:#left offset:[-11, -2]
    groupBox gbxFrames " Frame Span " width:98 height:56 align:#left offset:[-10, -56]
 
    progressBar pbPercent width:98 height:7 value:0 color:(color 0 197 0) align:#center offset:[0, -2]
    button btSelect "Select Faces" width:98 height:16 align:#center offset:[0, -5]
 
-- Functions -------------------------------------------------------------------
 
    function getBackFacesInRange obj camScan iFrameA iFrameZ &progress: =
    (
        local p3ViewDir = [0,0,0]
        local p3ViewPos = [0,0,0]
 
        local p3FaceCenter = [0,0,0]
        local p3ScanDir = [0,0,0]
 
        if (classOf obj == Editable_Poly) then
        (
            local baFaces = #{1..(polyOp.getNumFaces obj)}
            local baBackFaces = baFaces
            local baFrameBackFaces = #{}
 
            for iFrame = iFrameA to iFrameZ by 1 do
            (
                at time iFrame
                (
                    p3ViewDir = -camScan.transform.row3
                    p3ViewPos = camScan.position
 
                    baFrameBackFaces = #{}
 
                    for iFace in baFaces do
                    (
                        p3FaceCenter = polyOp.getSafeFaceCenter obj iFace
                        if (p3FaceCenter == undefined) then
                            p3FaceCenter = polyOp.getFaceCenter obj iFace
 
                        if (camScan.orthoProjection) then
                            p3ScanDir = p3ViewDir
                        else
                            p3ScanDir = normalize (p3FaceCenter - p3ViewPos)
 
                        p3FaceNormal = polyOp.getFaceNormal obj iFace
 
                        if ((dot p3FaceNormal p3ScanDir) > 0) then
                            baFrameBackFaces[iFace] = true
                    )
                    baBackFaces *= baFrameBackFaces
                )
                if (progress != unsupplied) then
                    progress = ((iFrame - iFrameA) as Float) / (iFrameZ - iFrameA) * 100
            )
            polyOp.setFaceSelection obj baBackFaces
            forceCompleteRedraw()
        )
        else if (classOf obj == Editable_Mesh) then
        (
            local baFaces = #{1..(meshOp.getNumFaces obj)}
            local baBackFaces = baFaces
            local baFrameBackFaces = #{}
 
            for iFrame = iFrameA to iFrameZ by 1 do
            (
                at time iFrame
                (
                    p3ViewDir = -camScan.transform.row3
                    p3ViewPos = camScan.position
 
                    baFrameBackFaces = #{}
 
                    for iFace in baFaces do
                    (
                        p3FaceCenter = meshOp.getFaceCenter obj iFace
 
                        if (camScan.orthoProjection) then
                            p3ScanDir = p3ViewDir
                        else
                            p3ScanDir = normalize (p3FaceCenter - p3ViewPos)
 
                        p3FaceNormal = getFaceNormal obj iFace
 
                        if ((dot p3FaceNormal p3ScanDir) > 0) then
                            baFrameBackFaces[iFace] = true
                    )
                    baBackFaces *= baFrameBackFaces
                )
                if (progress != unsupplied) then
                    progress = ((iFrame - iFrameA) as Float) / (iFrameZ - iFrameA) * 100
            )
            setFaceSelection obj baBackFaces
            forceCompleteRedraw()
        )
        else
        (
            throw "Wrong input in function getBackFacesInRange()"
        )
    )
 
-- Events ----------------------------------------------------------------------
 
    on pbtObj rightClick do
        pbtObj.object = undefined
 
    on pbtCamera rightClick do
        pbtCamera.object = undefined
 
    on btSelect pressed do
        if ( (pbtObj.object != undefined) and (pbtCamera.object != undefined) ) then
        (
            getBackFacesInRange pbtObj.object pbtCamera.object spFrameA.value spFrameZ.value progress:&pbPercent.value
            pbPercent.value = 0
        )
 
) -- End Rollout
 
createDialog rolTest 104 147 style:#(#style_toolwindow, #style_border, #style_sysmenu)