[Help pls] How to make increment for raycast (And more)

[ApeRuss]

Alright so I’m working on this placement system to learn more about it, I have couple problems I want to solve that I couldn’t find on other topics but I hope this one will help and will sure help others having the same issue

With the current placement system that I created using mouse and raycast I don’t really know how I would implement increment system so it’s smoother to build and not have a messy crap that isn’t lined up. Here’s a video:

I also have another problem that I don’t know how to make model be flat on the surface and not go through (also so it doesn’t rotate), I don’t know how to explain it but here’s a video:

Raycast:

	local raycastparams = RaycastParams.new()
	raycastparams.FilterType = Enum.RaycastFilterType.Blacklist
	raycastparams.FilterDescendantsInstances = {player.Character}
	raycastparams.IgnoreWater = true
	
	local posting = game.Workspace.Camera:ScreenPointToRay(mouse.X, mouse.Y)
	
	raycasthit = game.Workspace:Raycast(posting.Origin, posting.Direction * 300, raycastparams)

Positioning:

blocting.CFrame = CFrame.new(raycasthit.Position, raycasthit.Position + raycasthit.Normal)

If you can help me with either of those I would really appreciate that, if need more information hollar at me in the replies

[2kvigilanxe (1oho2i3h5oih37o)]

grid system:

How to make a working Grid System in Roblox

You need to know basis of scripting or you’ll not understand this tutorial Also its simple, so listen carefully, here is how it works: Step 1 Basically, you need to know what is position of block, Example: If you have this blue square, the center of it, from all sides is the position, like if left of of the block is (5,1,5), center is (5.5,1,5) then block position will be the centre of it position Step 2 Raycasting If you don’t know what this is then le…

For the rotate part, I’m not quite sure. I use mouse.TargetFilter to ignore that part.

[ApeRuss]

What about model colliding with another model, how can I prevent that?

[2kvigilanxe (1oho2i3h5oih37o)]

Try this:
If the placing block is on another placed block, get the height of the placed block, then do something like placing block.Position.Y = placing block.Position.Y - placed block.Position.Y. I am not sure, this is the only solution I can think of.

[ApeRuss]

I don’t really get what you mean cuz it’s raycast

blocting:SetPrimaryPartCFrame(CFrame.new(raycasthit.Position, raycasthit.Position + raycasthit.Normal))

[su0002 (su0)]

To avoid any unexpected rotation you should work only with Position (not with the whole CFrame). To keep it aligned, the simplest way is to round to the desired integer.

Here I restrict it to 1 stud

while true do
	task.wait()
	
	local raycastparams = RaycastParams.new()
	raycastparams.FilterType = Enum.RaycastFilterType.Blacklist
	raycastparams.FilterDescendantsInstances = {player.Character, blocting}
	raycastparams.IgnoreWater = true

	local posting = workspace.CurrentCamera:ScreenPointToRay(mouse.X, mouse.Y)

	raycasthit = workspace:Raycast(posting.Origin, posting.Direction * 300, raycastparams)
	
	if raycasthit then
		blocting.Position = Vector3.new(math.floor(raycasthit.Position.X), math.floor(raycasthit.Position.Y) + blocting.Size.Y/2, math.floor(raycasthit.Position.Z))
	end
end

This is how I would restrict it to 2 studs

blocting.Position = Vector3.new(math.floor(raycasthit.Position.X/2)*2, math.floor(raycasthit.Position.Y/2)*2 + blocting.Size.Y/2, math.floor(raycasthit.Position.Z/2)*2)

[ApeRuss]

That actually works, I really needed this and it helps!

But can you also solve this problem so it doesn’t collide with other parts I beg you I can’t figure this out

[ApeRuss]

Works perfectly! I just need this collide problem solved and this thread will be finished! I appreciate y’all

[su0002 (su0)]

Ok. Usually in a positioning system we handle Models. Then we simply use the MoveTo method.

Here I change blocting to a model

	if raycasthit then
		local pos = Vector3.new(math.floor(raycasthit.Position.X), math.floor(raycasthit.Position.Y) + blocting.PrimaryPart.Size.Y/2, math.floor(raycasthit.Position.Z))
		blocting:MoveTo(pos)
	end

[ApeRuss]

It works!

I appreciate for your help, have a great day!