Hello everyone, I want to make a system so that the polygon always turns towards the player’s camera. This is done to ensure that both sides of the model have the same shading, which is not achieved with DoubleSided.
How can you detect that a player is looking at the back of the polygon? of all the information, there is only this:
ChatGPT can explain it better than i can so i’ll just share the conversation.
here is the refined code and a place file of a working version.
PlaceFile.rbxl (57.5 KB)
local camera = workspace.CurrentCamera
local p1 = workspace:WaitForChild("P1").Position
local p2 = workspace:WaitForChild("P2").Position
local p3 = workspace:WaitForChild("P3").Position
local function getTrianglePlane(p1, p2, p3)
local v1 = p2 - p1
local v2 = p3 - p1
local normal = v1:Cross(v2) -- (A, B, C)
local D = -normal:Dot(p1) -- Compute D
return normal, D
end
local function pointPlaneSide(normal, D, point)
local distance = normal:Dot(point) + D
return distance
end
game:GetService("RunService").Heartbeat:Connect(function()
local cameraPosition = camera.CFrame.Position
local normal, D = getTrianglePlane(p1, p2, p3)
local side = pointPlaneSide(normal, D, cameraPosition)
if side > 0 then
print("front side")
elseif side < 0 then
print("back side")
else
print("on the triangle's plane.")
end
end)
This stops working with Editable Mesh triangles, but it works, but incorrectly