I want to find corners of part but I dont know how. So I have a part in workspace and I know its position and size, and I need to find 8 corners positions like Vector3 values, but position and size are vector3 too. This is my part (the red and blue circles are corners I need to find positions of):
Thank you for your solution but I cant understand the code because Im not very good at vectors. I’d be happy if you could explain how it works 
Sure,
On the solution, see you can see that you can get one corner by using:
local Size = Part.Size
local CornerPos = (Part.CFrame * CFrame.new(Size .X/2, Size .Y/2 , Size .Z/2)).Position
That will give you one corner so all you have to do is indicate where each corner using a table!
After you just need to multiple each vertex by the corresponding value:
for _, Vector in pairs(Vertices) do
local CornerPos = (Part.CFrame * CFrame.new(Size .X/2 * Vector[1], Size .Y/2 * Vector[2], Size .Z/2
Vector[3])).Position
end
If you wanted to get/find the bottom front right corner, then you would multiply the top front right corner (the corner got from doing local CornerPos = (Part.CFrame * CFrame.new(Size .X/2, Size .Y/2, Size .Z/2)). Position, by that. So if the top front right corner had a position of 10, 10, 10, then the bottom front right corner would have a position of 10, -10, -10!
I hope this helps!
This post simplifies it a bit, Simplifying Code? - #3 by TOP_Crundee123
Do you have any idea on how I wrap it into a function ? Like: function getcorners(part) … end
Because I need it to be a function returning a table with corners, so I can take a corner key from table and get its position as value…
so how do i find corners of part? it didn help
The previous link that @luckysuperman2 had the answer:
What part of that answer are you having trouble with?
I dont understand it it is complicated. Basically, I want just a simple function that returns a table, so i can use keys as corner names to refrence vector3s.
I probably didnt make it clear , sorry. You dont have to solve it for me though.
As of right now I almost found a solution myself, it involves lookvector/upvector/rightvector. I will add them to part’s cframe and multiply by value of part’s half size on that axis to get part’s face center. Then do this 2 more times but with other vectors and axes and so I get to my target corner. Now I just need to repeat it for every corner but in different order.
I will send my solution in here when its ready.
I understand what your question is. The answer I linked gives you the exact code you need, though. You can put it in a function if you want:
local Vertices = {
{1, 1, -1}, --v1 - top front right
{1, -1, -1}, --v2 - bottom front right
{-1, -1, -1},--v3 - bottom front left
{-1, 1, -1}, --v4 - top front left
{1, 1, 1}, --v5 - top back right
{1, -1, 1}, --v6 - bottom back right
{-1, -1, 1},--v7 - bottom back left
{-1, 1, 1} --v8 - top back left
}
local function GetCorners(Part)
local corners = {}
for _, Vector in pairs(Vertices) do
table.insert(corners, (Part.CFrame * CFrame.new(Size .X/2 * Vector[1], Size .Y/2 * Vector[2], Size .Z/2 * Vector[3])).Position)
end
return corners
end
Then call GetCorners to get a table of the corners. Again, credit to @VegetationBush.
This isnt quite what I want. It doesnt have to involve loops. Just let me solve it myself and I will send it in here.
Done:
function getCorners(part)
local cf = part.CFrame
local size = part.Size
local corners = {}
-- helper cframes for intermediate steps
-- before finding the corners cframes.
-- With corners I only need cframe.Position of corner cframes.
-- face centers - 2 of 6 faces referenced
local frontFaceCenter = (cf + cf.LookVector * size.Z/2)
local backFaceCenter = (cf - cf.LookVector * size.Z/2)
-- edge centers - 4 of 12 edges referenced
local topFrontEdgeCenter = frontFaceCenter + frontFaceCenter.UpVector * size.Y/2
local bottomFrontEdgeCenter = frontFaceCenter - frontFaceCenter.UpVector * size.Y/2
local topBackEdgeCenter = backFaceCenter + backFaceCenter.UpVector * size.Y/2
local bottomBackEdgeCenter = backFaceCenter - backFaceCenter.UpVector * size.Y/2
-- corners
corners.topFrontRight = (topFrontEdgeCenter + topFrontEdgeCenter.RightVector * size.X/2).Position
corners.topFrontLeft = (topFrontEdgeCenter - topFrontEdgeCenter.RightVector * size.X/2).Position
corners.bottomFrontRight = (bottomFrontEdgeCenter + bottomFrontEdgeCenter.RightVector * size.X/2).Position
corners.bottomFrontLeft = (bottomFrontEdgeCenter - bottomFrontEdgeCenter.RightVector * size.X/2).Position
corners.topBackRight = (topBackEdgeCenter + topBackEdgeCenter.RightVector * size.X/2).Position
corners.topBackLeft = (topBackEdgeCenter - topBackEdgeCenter.RightVector * size.X/2).Position
corners.bottomBackRight = (bottomBackEdgeCenter + bottomBackEdgeCenter.RightVector * size.X/2).Position
corners.bottomBackLeft = (bottomBackEdgeCenter - bottomBackEdgeCenter.RightVector * size.X/2).Position
return corners
end
Testing:
for cornerName, cornerPos in pairs(getCorners(workspace.CornersPart)) do
newPart(cornerPos)
end
Final results:
I feel for your fingers.
There is a special function of CFrame called CFrame:PointToWorldSpace()
Basically it transforms the entire world to the part. This makes it easy to get Position relative to the part.
Also, this is if you want to get a Direction relative to the part CFrame:VectorToWorldSpace()
-- Pro tip: if you find yourself repeating code there is probably a better way of writing it.
local FRT = Part.CFrame:PointToWorldSpace(Vector3.new(Part.Size.X/2,Part.Size.Y/2,Part.Size.Z/2)
local Vis = Instance.new("Part",workspace)
Vis.Size = Vector3.new(0.1,0.1,0.1)
Vis.Position = FRT
I will look into it. Thank you for your tips.
does this work on complex shapes?
@sktvladimir535 No, only cubes. However, it does support CFrame translations such as Position and Rotation. Please do some testing yourself before you bump a 3-year-old post.
Also, I want to thank you, @koziahss because this helped me out tremendously with one of my projects. Thank you so much <3