Small question; How do I make a bullet hole using SurfaceGUI?

[Th1v5 (Thivs)]

I just want to simply create a bullet hole image on a surface gui. I didn’t even think of this problem when I started, but I can’t actually think of how to solve it:
How do I figure out which FACE of the part I hit? I can’t just use Result.Normal, because that is just a direction, not a surface. I want it so if, for example, a part is rotated, and I shoot it’s left side, I can tell it 's the left side of the part, and apply a surface gui appropriately. I don’t know how to get this information out of a normal, though.

[uriel_Gamer444 (Uri)]

Make a small part with a decal on the back, place in on the hit position and make it face towards the normal, i don’t know how to do the last part honestly

[Th1v5 (Thivs)]

This is… what I used to do, and specifically has none of the benefits I’m looking for. Thanks for the input though!

[uriel_Gamer444 (Uri)]

Why do you need a SurfaceGUI specifically, also the SurfaceGUI will worth a bit weirdly with round objects i think + it covers the entire side of the object instead of a small part so you’ll have to resize the part to be exactly where you want it, you can do that with Maths anyways

[Th1v5 (Thivs)]

I want a surface gui for a variety of reasons, mainly being the fact that bullet hole decals may go off the edge. Also, I have no intent to use round objects.

[wrello]

local function getNormalId(normalVector)
	for _, normalId in ipairs(Enum.NormalId:GetEnumItems()) do
		if Vector3.FromNormalId(normalId) == normalVector then
			return normalId
		end
	end
end

print(getNormalId(Vector3.xAxis)) -- Enum.NormalId.Right

[Th1v5 (Thivs)]

What if my vector3 isnt just (0,1,0) or something like that. If a part was rotated, would the code still work there? I haven’t ran this yet, but it looks like that might be a problem. If I’m wrong, sorry.

[wrello]

Forgot about that sorry.

local function getNormalId(part, worldSpaceNormalVector)
    local objectSpaceNormalVector = part.CFrame:VectorToObjectSpace(worldSpaceNormalVector)

	for _, normalId in ipairs(Enum.NormalId:GetEnumItems()) do
		if Vector3.FromNormalId(normalId) == objectSpaceNormalVector then
			return normalId
		end
	end
end

print(getNormalId(part, RaycastResult.Normal))

[Th1v5 (Thivs)]

I’ll try this out in a moment.

[Th1v5 (Thivs)]

There are rounding errors which prevent it from equalling properly, and no matter what I do, I can’t fix them! I’ve tried a variety of different things, and nothing works.

[Th1v5 (Thivs)]

Ok, nevermind! I Squashed the error and it works now, but the rounding error was a bit… painful to fix

[Lord_BradyRocks]

Hi, can you share what your end solution was that you fixed?

Thanks

[Th1v5 (Thivs)]

I just did some… inefficent rounding to say the least. (All the simple methods didn’t work)

local osnv = part.CFrame:VectorToObjectSpace(worldSpaceNormalVector)
	local x = 0
	local y = 0
	local z = 0
	if osnv.X > 0.9 or osnv.X < -0.9 then
		x = math.round(osnv.X)
	end
	if osnv.Y > 0.9 or osnv.Y < -0.9 then
		y = math.round(osnv.Y)
	end
	if osnv.Z > 0.9 or osnv.Z < -0.9 then
		z = math.round(osnv.Z)
	end
	osnv = Vector3.new(x,y,z)

[wrello]

To compare two vectors you can use Vector3:FuzzyEq(Vector3) which basically checks to see if they are close to equal (within .00001 studs default).