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How to show Mesh? — Gideros Forum
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    How to show Mesh?

    ArtiomArtiom Member
    edited July 2013 in General questions
    Hello,
    I have a some trouble with Mesh, can't figure out how to show it.
    My code:

    local screenOffsetX = application:getLogicalTranslateX() / application:getLogicalScaleX()
    local screenOffsetY = application:getLogicalTranslateY() / application:getLogicalScaleY()

    local backgroundMesh = Mesh.new()

    backgroundMesh:setVertex(1, 0 - screenOffsetX, 0 - screenOffsetY)
    backgroundMesh:setVertex(2, application:getLogicalWidth() - screenOffsetX, 0 - screenOffsetY)
    backgroundMesh:setVertex(3, application:getLogicalWidth() - screenOffsetX, application:getLogicalHeight() - screenOffsetY)

    backgroundMesh:setColor(1, 0x127ef8)
    backgroundMesh:setColor(2, 0x127ef8)
    backgroundMesh:setColor(3, 0x127ef8)

    stage:addChildAt(backgroundMesh, 1)

    I can't see anything, what I'm doing wrong?
    Thank you

    Likes: dr_max

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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      Accepted Answer
      @Artiom only thing you need to add is to set the index array
      backgroundMesh:setIndexArray(1,2,3)
      http://appcodingeasy.com/Gideros-Mobile
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    • ArtiomArtiom Member
      edited July 2013
      Oh.. thank you, that works :)
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    • ArtiomArtiom Member
      Mesh can be only triangle? Can I make quad?
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    • ar2rsawseenar2rsawseen Maintainer
      :)
      Unfortunately no, thats is the limitation of the Mesh, that it can only be draw in triangles, thus you will need a triangulation algorithm to draw complex shapes.
      For rectangle you would need two triangles.
      local w, h = application:getContentWidth(), application:getContentHeight()
 
	-- ------------------------------------------
	-- Create Mesh
	-- ------------------------------------------
 
	-- Create a new mesh object
	local mesh = Mesh.new()
 
	-- set Vertices
	mesh:setVertices(
                                1, w*.25, h*.25,
				2, w*.75, h*.25,
				3, w*.75, h*.75,
				4, w*.25, h*.75					
			         )
 
	-- set Indices
	mesh:setIndexArray(	
                                1, 2, 3,
				1, 3, 4
				)
 
	-- set Colors
	mesh:setColorArray(
				0x000000, 1, 0x000000, 1,
				0x00FFFF, 1, 0x00FFFF, 1						
				)
 
	-- get bounds
	local x, y, w, h = mesh:getBounds(mesh)
 
	-- create mesh-parent-stage hierarchy
	local parent = Sprite.new()
	parent:addChild(mesh)
	stage:addChild(parent)
 
	-- calculate the center
	local cx = x + w / 2
	local cy = y + h / 2
 
	-- set the center
	parent:setPosition(cx, cy)
	mesh:setPosition(-cx, -cy)
      http://appcodingeasy.com/Gideros-Mobile
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