Godot Version
4.4.1
Question
Hi Folks,
I’m trying to create a HeightMapShape3D from external data. I’m very new to Godot, so please be gentle with me 
I have a scene that includes a .glb file (named Track here) and I’d like to create a heightmap that matches the ground of the model. I already have height data for this. My scene looks like this:
I’ve created the TrackHeightMap element as a
StaticBody3D and then attached the following script to it:
extends StaticBody3D
var heightmap_shape = HeightMapShape3D.new()
# Called when the node enters the scene tree for the first time.
func _ready() -> void:
var file = FileAccess.open("track.json", FileAccess.READ)
var json = JSON.new()
var content = file.get_as_text()
var error = json.parse(content)
var heightfield_data
if error == OK:
var data_received = json.data
heightfield_data = data_received["heightfield"]
else:
print("JSON Parse Error: ", json.get_error_message(), " in ", content, " at line ", json.get_error_line())
var height_map_array = PackedFloat32Array()
height_map_array.resize(len(heightfield_data))
for i in height_map_array.size():
height_map_array[i] = heightfield_data[i]
heightmap_shape.map_depth = sqrt(len(heightfield_data))
heightmap_shape.map_width = sqrt(len(heightfield_data))
heightmap_shape.map_data = height_map_array
I can see that my heightmap_shape variable looks to have the data I would expect, but I don’t think I have the heightmap I’m expecting (when I load something into a scene that contains this scene it appears to just fall through the ground).
What am I doing wrong? Do I need to assign the heightmap to the StaticBody3D (TrackHeightMap) somehow? Is this the right approach for programmatically creating a heightmap? How would I assign a color to the heightmap so I can see it in some kind of debug mode?
Many thanks, Tom