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Hello, I'm currently testing to see if I can do 3D. And I have a square with 2 polygons, but to make it 3D and apply a rotation matrix I would have to make a Z value. I have no idea how to do that. Any help appreciated!

 
polygons = 
{ 
	{ verts = {{x=40, y=40}, {x=80, y=40}, {x=80, y=80}} },
	{ verts = {{x=40, y=40}, {x=40, y=80}, {x=80, y=80}} }
}

function _init()
end

function _update()
end

function _draw()
	cls()	

	for i = 1, #polygons do
		if polygons[i] and polygons[i].verts then
			_drawPolygon(polygons[i])
		end
	end
end

function _drawPolygon(polygon)
	local total_verts = #polygon.verts
	for i = 1, total_verts do
		local next_vert = (i % total_verts) + 1
		local x1, y1 = polygon.verts[next_vert].x, polygon.verts[next_vert].y
		local x2, y2 = polygon.verts[i].x, polygon.verts[i].y
		line(x1, y1, x2, y2, 7)	
	end
end



There's no native 3D so implementing this is up to you. Get out some graph paper and plot how a depth of some z value at a given x,y would impact the x and y screen coordinates where that vertex is actually drawn. You can also search for tutorials on existing methods for 3D projection on PICO-8. Good luck!



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