Raycast Not Detecting Water (Or Anything) Under Boat

  1. What do you want to achieve?
    I’ve been trying to make a raft/boat that goes at full speed only when it’s in water, and slows down significantly when it’s not

  2. What is the issue?
    When printing the raycast result, it always prints nil, no matter what solution I’ve tried. The raycast always finds nothing, no matter what’s below it.

    Screen Shot 2023-12-09 at 8.53.03 AM

  3. What solutions have you tried so far?
    I looked through many solutions of the DevForum, but the ones that make sense don’t seem to work. I tried increasing the direction length from -1 to -100, I tried bringing the raycast origin height to a higher position, etc.

Example of something I tried:

  1. My code:
local rayParams = RaycastParams.new(workspace.Terrain)
rayParams.FilterType = Enum.RaycastFilterType.Include
rayParams.IgnoreWater = false

local function waterMult()
	local result = workspace:Raycast(Vector3.new(primary.Position)+Vector3.new(0,10,0), Vector3.new(0,-1,0)*100, rayParams)
	print(result) -- always printing nil
	if result then
		if result.Material == Enum.Material.Water then
			return 1 -- full speed
			return .1 -- diminished speed
	return .1 -- no result found (diminished speed)

What is primary? RaycastParams.new doesn’t recieve a parameter, so I’m not sure what you were trying to do. You also shouldn’t using Enum.RaycastFilterType.Include.

Code (assuming that primary is just a part in the boat, and that primary.Parent is the boat’s model):

local rayParams = RaycastParams.new()
rayParams.FilterType = Enum.RaycastFilterType.Exclude

local function waterMult()
	rayParams.FilterDescendantsInstances = {primary.Parent}

	local result = workspace:Raycast(primary.Position + Vector3.new(0, 10, 0), Vector3.new(0, -100, 0), rayParams)
	if result and result.Material == Enum.Material.Water then
		return 1 -- full speed
	return .1 -- no result found (diminished speed)

Also, .IgnoreWater is by default set to false.

1 Like

My bad, I found a solution to my problem that doesn’t require raycasting at all. It works beautifully.
Thank you Katrist for helping me, you rewrote my code much more efficiently than I did

The code:

local function waterMult()
	local primePos = primary.Position

	local min = primePos - primary.Size
	local max = primePos + primary.Size
	local region = Region3.new(min,max):ExpandToGrid(4)

	local material = workspace.Terrain:ReadVoxels(region,4)[1][1][1]
	if material == Enum.Material.Water then
		return 1 -- full speed

	return .1 -- water not found (diminished speed)

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