How can I detect what face of a part a player clicks?

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#1

I’m making a minecraft-like building system. and so far I have only made it possible to create a part on top of the part you clicked.

my problem is that I have no idea how I can detect what side of the block I clicked, and place the block relative to that.

I’ve heard you need to cast a ray onto the block from your camera, but I’m not sure what to do after that.

thanks!

#2

I think this could be what you want?

I haven’t read much on this, but you could potentially combine this with UserInputService as well to detect when a player clicks to check its target surface

1 Like
#3

Just to mention @Jackscarlett’s comment is a much simpler way of doing that.
You can use Ray-Casting and do:

function module:CreatePartAtPosition(vectorPos, normalVector) -- // vectorPos is rayCastResult.Position and normalVector is rayCastResult.Normal
	local part = Instance.new("Part", workspace.Decals)
	part.Transparency = 1
	part.Anchored = true
	part.CanCollide = not part.CanCollide
	part.CFrame = CFrame.new(vectorPos, vectorPos + normalVector)

Note: This is a part of a code I made for a spray tool.

#4

It doesn’t work for grid-building

#5

Sup, maybe this post has answers and further, detailed explanations of problem you are facing. (Too long for me to read and pull out the juicy info for you xd)