BushGen.lua

BushGen.lua

local BUSH_COUNT = 5

local function getCorners(basePart)
	local rotate = math.rad(90)
	return ({
		bottom = {
			back = {
				left = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, rotate, 0)).lookVector * (basePart.Size.X / 2))) - ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) - (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
				right = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, -rotate, 0)).lookVector * (basePart.Size.X / 2))) - ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) - (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
			};
			front = {
				left = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, rotate, 0)).lookVector * (basePart.Size.X / 2))) - ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) + (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
				right = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, -rotate, 0)).lookVector * (basePart.Size.X / 2))) - ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) + (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
			};
		};
		top = {
			back = {
				left = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, rotate, 0)).lookVector * (basePart.Size.X / 2))) + ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) - (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
				right = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, -rotate, 0)).lookVector * (basePart.Size.X / 2))) + ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) - (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
			};
			front = {
				left = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, rotate, 0)).lookVector * (basePart.Size.X / 2))) + ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) + (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
				right = ((basePart.Position + ((basePart.CFrame * CFrame.Angles(0, -rotate, 0)).lookVector * (basePart.Size.X / 2))) + ((basePart.CFrame * CFrame.Angles(rotate, 0, 0)).lookVector * (basePart.Size.Y / 2))) + (basePart.CFrame.lookVector * (basePart.Size.Z / 2));
			};
		};
	});
end

local selection_part = game.Selection:Get()[1]
local bush_proto = game.ReplicatedStorage.GenGrass.BushProto
local bush_size = bush_proto.PrimaryPart.Size

local center = selection_part.Position
local size = selection_part.Size

local corners = getCorners(selection_part)

local pos_back = corners.top.back.left:Lerp(corners.top.back.right,0.5)
local pos_front = corners.top.front.left:Lerp(corners.top.front.right,0.5)
local vec_bbl_tbl = corners.top.back.left - corners.bottom.back.left
local up = vec_bbl_tbl * 0.5 + Vector3.new(0,bush_size.Y * 0.35,0)

for i=0,BUSH_COUNT do
	local t = i / BUSH_COUNT

	local neu_bush = bush_proto:Clone()
	neu_bush.Parent = selection_part

	local pos = pos_back:Lerp(pos_front,t)
	neu_bush:SetPrimaryPartCFrame(
		CFrame.new(pos.X + up.X,pos.Y + up.Y,pos.Z + up.Z) *
		CFrame.Angles(math.rad(selection_part.Rotation.X), math.rad(selection_part.Rotation.Y), math.rad(selection_part.Rotation.Z)) *
		CFrame.Angles(0,math.random() * 180,0)
	)
end