Add fixed in space and moveing example

moveing/main.lua

@@ -0,0 +1,40 @@
+local width = 7
+local height = 7
+local distance = 5
+local amplitude = 2
+local x = 0
+
+function getHeadsetMatrix()
+    local fx, fy, fz, fangle, fax, fay, faz = lovr.headset.getPose("head")
+    return lovr.math.newMat4(lovr.math.vec3(fx, fy, fz), lovr.math.vec3(1, 1, 1), lovr.math.quat(fangle, fax, fay, faz))
+end
+
+function drawGrid(pass, headMatrix)
+	local offset = math.sin(x)*amplitude
+
+	for i=-0.5,0.5,0.05 do
+		local startVect = headMatrix*lovr.math.newVec3(width*-1+offset, height*i, -distance)
+		local endVect = headMatrix*lovr.math.newVec3(width*1+offset, height*i, -distance)
+		pass:line(startVect, endVect)
+	end
+
+	for i=-0.5,0.5,0.05 do
+		local startVect = headMatrix*lovr.math.newVec3(width*i+offset, height*-1, -distance)
+		local endVect = headMatrix*lovr.math.newVec3(width*i+offset, height*1, -distance)
+		pass:line(startVect, endVect)
+	end
+end
+
+function lovr.draw(pass)
+	local headMatrix = getHeadsetMatrix()
+
+	x = x + 0.05
+
+	pass:setColor(0, 1, 0)
+	drawGrid(pass, headMatrix)
+
+	local center = headMatrix * lovr.math.newVec3(math.sin(x)*amplitude, 0.0, -distance)
+	pass:circle(center, 0.05, 0, 0, 0, 1, 'fill')
+
+end
+