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drawing lines wont show
Posted: 27 Feb 2013, 23:46
by PixelOfDeath
I can't get my widget to draw lines.
Very simple example:
Code: Select all
local function TestDraw()
gl.Color({1,1,1,0})
for sniper in pairs(sniperList) do
local x, y, z = Spring.GetUnitPosition(sniper)
gl.Vertex(x,y,z+1000)
gl.Vertex(x,y,z-1000)
gl.Vertex(x,y+1000,z)
gl.Vertex(x,y-1000,z)
gl.Vertex(x+1000,y,z)
gl.Vertex(x-1000,y,z)
end
end
function widget:DrawWorldPreUnit()
gl.DepthTest(true)
gl.BeginEnd(GL.LINE, TestDraw)
end
the part with the gl.Vertex gets called and the x,y,z values are ok. But there is nothing visible on screen. What am I doing wrong?
The OpenGL coordinates and the unit positions are the same I suppose!?
Re: drawing lines wont show
Posted: 28 Feb 2013, 00:06
by knorke
gl.Color({1,1,1,0})
the last 0 makes your color fully transparent
and need to set LineWidth
not good with gl but i tested like this and it draws a cross thing:
(uncomment the 2 lines if you dont want it visible through terrain)
Code: Select all
local function TestDraw()
gl.Color({1,1,1,0.5})
--for sniper in pairs(sniperList) do
local x, y, z = 100,100,100 --Spring.GetUnitPosition(sniper)
gl.Vertex(x,y,z+1000)
gl.Vertex(x,y,z-1000)
gl.Vertex(x,y+1000,z)
gl.Vertex(x,y-1000,z)
gl.Vertex(x+1000,y,z)
gl.Vertex(x-1000,y,z)
--end
end
function widget:DrawWorldPreUnit()
gl.PushAttrib(GL_LINE_BITS)
--gl.DepthTest(true)
gl.Color(1,0,1,0.5)
gl.LineWidth(10)
gl.BeginEnd(GL.LINES, TestDraw)
--gl.DepthTest(false)
gl.Color(1,1,1,1)
gl.PopAttrib()
end
The OpenGL coordinates and the unit positions are the same I suppose!?
yes
Re: drawing lines wont show
Posted: 28 Feb 2013, 00:27
by PixelOfDeath
You solved it without saying what it was xD
GL.LINES and not GL.LINE
Because GL.LINE is a valid opengl constant, this one was hard to catch.
Thx