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stuck with simple 3d
Posted: Sat Oct 22, 2011 5:55 pm
by kraftman
So i have this fairly simple code:
Code: Select all
local cubes = {}
for i = 1, 20 do
local c = {}
c.x = math.random(0,800)
c.y = math.random(0,600)
c.z = math.random(0,255)
tinsert(cubes, c)
end
function love.draw()
for i = 1, #cubes do
love.graphics.setColor(255,255,255,255-cubes[i].z)
love.graphics.rectangle("fill", cubes[i].x, cubes[i].y,10,10)
end
end
I want to add a basic 3d affect so that as i move the keys, the boxes move, but obviously at different speeds depending on their distance from the camera.
I'm guessing i need to add in a camera object and then work out the angles from there, but i'm not really sure how to do it.
Has anyone got a link to a decent tutorial on this kind of thing?
Re: stuck with simple 3d
Posted: Sat Oct 22, 2011 6:07 pm
by GijsB
you have a camera with a x,y and z position
for every block you draw you do like :
love.graphics.setColor(255,255,255,255-cubes
.z+cameraz)
love.graphics.rectangle("fill", cubes.x+camerax/cubes.z, cubes.y+cameray/cubes.z,10,10)
i think this will give you some nice fake 3D effect 
Re: stuck with simple 3d
Posted: Sat Oct 22, 2011 7:39 pm
by kraftman
GijsB wrote:you have a camera with a x,y and z position
for every block you draw you do like :
love.graphics.setColor(255,255,255,255-cubes
.z+cameraz)
love.graphics.rectangle("fill", cubes.x+camerax/cubes.z, cubes.y+cameray/cubes.z,10,10)
i think this will give you some nice fake 3D effect
nice one! now how do i rotate them? 
Re: stuck with simple 3d
Posted: Sat Oct 22, 2011 7:43 pm
by Robin
For 3D rotation, you need
matrix multiplication. I tried to do without them in Boids3D, but I couldn't figure out how it should happen then.
Re: stuck with simple 3d
Posted: Sat Oct 22, 2011 7:51 pm
by kraftman
Robin wrote:For 3D rotation, you need
matrix multiplication. I tried to do without them in Boids3D, but I couldn't figure out how it should happen then.
yeh I took a look a look at your code briefly but I couldn't get my head around it, got any tips on getting started?
Re: stuck with simple 3d
Posted: Sat Oct 22, 2011 9:25 pm
by Robin
If you don't know how matrix multiplication works, I'd start with that.