Fancy3D引擎sample学习（D&E）

1、drawboard

在三个画板内画三角形。

db = _DrawBoard.new(w, h) 创建画板指定宽高

指定画板的种类，db:drawImage(...) db:draw3DImage(...) db:drawBillBoard(...)

最后在_rd:useDrawBoard(db, color)   和 _rd:resetDrawBoard() 之间画三角形

_rd:drawTriangle(x1,y1,x2,y2,x3,y3,color)

PS：貌似最后画三角形的时候，三角形的x,y都是相对于画板中的。

---- DrawBoard Sample ----

_dofile("cameraControl.lua")

db = _DrawBoard.new(1000, 1000)

function draw()
    _rd:drawTriangle(200, 0, 50, 200, 350, 200, _Color.Blue)
    _rd:fillTriangle(200, 0, 50, 200, 350, 200, _Color.Red)
end

function boardDraw()
    _rd:drawAxis(500)
    db:drawImage(0, 0, 200, 200)
    db:draw3DImage(0, 0, 0, 20, 10, 10, 30, 30, 15)
    db:drawBillboard(50, 50, 0, 5, 5)
end

_app:onIdle(boardDraw)

_rd:drawAxis(500)
_rd:useDrawBoard(db, _Color.White)
draw()
_rd:resetDrawBoard()

db:saveToFile("board.bmp", 0)

 2、drawboard-blocker

观察girl在四个挡板中的动作，当出现半透明遮挡后，改变颜色

_rd.blockColor = _Color.XX

_rd.blockee = true  设置半透明遮挡后，当物体有遮挡出现时会呈现XX颜色

3、drawboard-copy2image

程序主要为了说明_DrawBoard类是特殊的_Image类

img = _Image.new(db) 相当于复制这个_DrawBoard到img中

PS：

local x = _rd.w / 2
local y = _rd.h / 2     -- 这里就是找到屏幕的中心点

img:drawImage(x - 200, y - 150, x + 200, y + 150)   然后设置img的大小

_dofile('cameracontrol.lua')
_rd.camera.eye = _Vector3.new(10, 10, 10)

cube = _mf:createCube()
teapot = _mf:createTeapot()
plane = _mf:createPlane()

sky = _SkyLight.new()
sky.direction = _Vector3.new(-1, -1, -1)
sky.color = _Color.Green

_rd:useLight(_AmbientLight.new())
_rd:useLight(sky)

db = _DrawBoard.new(400, 300)
_rd:useDrawBoard(db, _Color.Gray)
    _rd:pushMatrix3D(_Matrix3D.new():setScaling(20, 20, 20))
        plane:drawMesh()
    _rd:popMatrix3D()

    _rd:pushMatrix3D(_Matrix3D.new():setTranslation(-2, 0, 1))
        cube:drawMesh()
    _rd:popMatrix3D()

    _rd:pushMatrix3D(_Matrix3D.new():setTranslation(2, 0, 1))
        teapot:drawMesh()
    _rd:popMatrix3D()
_rd:resetDrawBoard()
_rd:popLight()
_rd:popLight()

img = _Image.new(db)
db = nil
_gc()

_app:onIdle(function(e)
    local x = _rd.w / 2
    local y = _rd.h / 2
    img:drawImage(x - 200, y - 150, x + 200, y + 150)
end)

 4、drawboard-edge

_rd.edge = true  -- 设置是否描边

_rd.edgeColor = _Color.XX -- 设置描边颜色

5、drawboard-glow

_rd.glowFactor = number 设置亮度，范围【0,1】

6、drawboard-hollow

如果在_rd中指定了一个_DrawBoard那么里面的坐标都是相对于这个画板的，比如fillRect()填充矩形

_sys:addPath('res')

_rd.bgColor = _Color.DarkBlue

db = _DrawBoard.new(400, 300)
_rd:useDrawBoard(db, 0x80808080)
_rd:fillRect(50, 50, 350, 250, _Color.Red)

bl = _Blender.new()
bl:copy()
_rd:useBlender(bl)
_rd:fillRect(100, 100, 300, 200, 0x80808080)
_rd:popBlender()

_rd:resetDrawBoard()

_app:onIdle(function(e)
    local x = _rd.w / 2
    local y = _rd.h / 2
    db:drawImage(x - 200, y - 150, x + 200, y + 150)
end)

 7、drawboard-shadow

设置人物动画的阴影效果

_rd.shadowLight = _Vector3.new(1, 1, -1)  -- 设置光的方向

_rd.shadowColor = _Color.XX                    -- 设置阴影的颜色

_rd.shadowCaster = true

msh:drawMesh()     ...

_rd.shadowCaster = false       -- 设置发射投影的meh

_rd.shadowReceiver = true

plane:drawMesh()    ...

_rd.shawReceiver = false         -- 设置接收投影的meh

_dofile( "cameraControl.lua" )
_sys:addPath( "res" );

msh = _Mesh.new( "face.skn" );
msh:addSubMesh( "body1.skn" );
msh:addSubMesh( "hair.skn" );
msh:addSubMesh( "leg1.skn" );
msh:addSubMesh( "arm.skn" );

anima = msh:attachSkeleton( "girl.skl" ):addAnima( "san1.san" );
anima.loop = true;
anima:play( );

plane = _mf:createPlane( );
plane.transform:setScaling( 100, 100, 100 );

_rd.shadowLight = _Vector3.new( 1, 1, -1 );
_rd.shadowColor = _Color.Black;

db = _DrawBoard.new( 800, 600 );
_app:onIdle( function( )
    _rd:drawAxis( 100 );

    _rd.shadowReceiver = true;                          -- 地面接收产生阴影效果
    plane:drawMesh( );
    _rd.shadowReceiver = false;
    
    _rd.shadowCaster = true;                            -- 人物投射
    msh:drawMesh( );
    _rd.shadowCaster = false;

    -- Use drawboard.
    _rd:useDrawBoard( db, _Color.Gray );

    _rd.shadowReceiver = true;
    plane:drawMesh( );
    _rd.shadowReceiver = false;
    
    _rd.shadowCaster = true;
    msh:drawMesh( );
    _rd.shadowCaster = false;
    
    _rd:resetDrawBoard( );
    
    db:drawImage( 0, 0, 400, 300 );
end )

_app:onKeyDown( function( kc )
    if kc == _System.KeySpace then
        _sys.gpuSkinning = _sys.gpuSkinning == false;
        print( "Use GPU:", _sys.gpuSkinning );
    end
end )

 8、efficiency-meshrender

按A随机添加一百个meh，空格停止动画，S设置阴影效果，DEL删除，R重新设置摄像机位置

PS：onIdle()相当于刷新屏幕的过程；scene:render()调用scene:onRender(function(node)...end)

node是场景中的结点，例如:mesh

--efficiency-meshrender
-- Press the 'a' key add 100 role,press the 'space' key control role action,press 'delete' key delete all role,press 's' key control shadow,press 'r' reset camera
-- In the upper-left corner of the screen to record the number of the role
_dofile('cameracontrol.lua')
_sys:addPath('res')
scene = _Scene.new();
font1 = _Font.new('Arial', 12)
font2 = _Font.new('Arial', 12)
plane = _mf:createPlane()
_mf:paintDiffuse(plane, _Color.Gray)
mat1 = _Matrix3D.new():setScaling(400, 400, 400)
animaflag = false
shflag = false
num, count, tab = 100, 0, {}

_rd.bgColor = _Color.DarkBlue

function getmyMesh()
    local role = _Mesh.new()
    role:addSubMesh('arm.skn')
    role:addSubMesh('face.skn')
    role:addSubMesh('hair.skn')
    role:addSubMesh('body2.skn')
    role:addSubMesh('leg2.skn')
    skl = _Skeleton.new('girl.skl')
    role:attachSkeleton(skl)
    san = skl:addAnima('idle.san')
    san.loop = true
    san.name = 'idle'
    san:play()
    return role
end
function addMesh(num)
    for i = 1, num do
        local s = getmyMesh()
        tab[#tab + 1] = scene:add(s, _Matrix3D.new():setTranslation(_random(-150, 150), _random(-150, 150), 0))
    end
end
function delNode()
    for i = 1, #tab do
        scene:del(tab[i])
    end
end
function animaStopOrPlay()
    for i = 1, #tab do
        local san = tab[i].mesh.skeleton:getAnima('idle')
        if not animaflag then
            san:stop()
        elseif animaflag then 
            san.loop = true
            san:play()
        end
    end
end
function reset()
    _rd.camera.eye.x = 100
    _rd.camera.eye.y = 100
    _rd.camera.eye.z = 100
    _rd.camera.look.x = 0
    _rd.camera.look.y = 0
    _rd.camera.look.z = 0
end

scene:onRender(function(node)
    if node.mesh then
        if shflag then
            _rd.shadowCaster = true
            _rd.shadowLight = _Vector3.new(0, 1, -1);
        end
        count = count + 1
        node.mesh:drawMesh()
        if shflag then
            _rd.shadowCaster = false
        end
    end
end)

_app:onKeyDown(function(x)
        if x == _System.KeyA then
            addMesh(num)
        elseif x == _System.KeySpace then
            animaStopOrPlay()
            animaflag = not animaflag
        elseif x == _System.KeyDel then
            delNode()
        elseif x == _System.KeyR then
            reset()
        elseif x == _System.KeyS then
            shflag = not shflag
        end
end)

_app:onIdle(function(elapse)
    _rd:drawAxis(50)
    count = 0
    if shflag then
        _rd.shadowReceiver = true
    end
    _rd:pushMatrix3D(mat1)
        plane:drawMesh()
    _rd:popMatrix3D()
    if shflag then
        _rd.shadowReceiver = false
    end
    scene:render();
    font1:drawText(5, 20, 0, 0, 'The role number is ' .. count)
    font2:drawText(5, 0, 0, 0, "Press the 'a' key add 100 role,press the 'space' key control role action,press 'delete' key delete all role,press 's' key control shadow,press 'r' reset camera")
end)