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Fix terrain: add planar UVs, drop generate_tangents (no normal map needed)

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dev
2026-11-03 22:26:01 +00:00
parent 180b776392
commit bfe90a1b11
1 changed files with 12 additions and 5 deletions
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17
scripts/world/terrain.gd
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@@ -29,8 +29,10 @@ func _build() -> void:
var step := float(size) / float(resolution) var step := float(size) / float(resolution)
var half := size * 0.5 var half := size * 0.5
var uv_scale := 1.0 / float(size)
# Build a grid of quads, two triangles each. # Build a grid of quads, two triangles each. Each vertex carries a planar UV
# (world-XZ mapped to 0..1) so the surface is ready for texturing later.
for z in range(resolution): for z in range(resolution):
for x in range(resolution): for x in range(resolution):
var x0 := x * step - half var x0 := x * step - half
@@ -43,11 +45,13 @@ func _build() -> void:
var p01 := Vector3(x0, _height(noise, x0, z1), z1) var p01 := Vector3(x0, _height(noise, x0, z1), z1)
var p11 := Vector3(x1, _height(noise, x1, z1), z1) var p11 := Vector3(x1, _height(noise, x1, z1), z1)
_add_tri(st, p00, p01, p11) _add_tri(st, p00, p01, p11, half, uv_scale)
_add_tri(st, p00, p11, p10) _add_tri(st, p00, p11, p10, half, uv_scale)
# Normals give the lighting its shape. Tangents are only needed for normal
# maps, which this low-poly material doesn't use — so we skip them (and avoid
# the "UVs required to generate tangents" error).
st.generate_normals() st.generate_normals()
st.generate_tangents()
var mesh := st.commit() var mesh := st.commit()
var mi := MeshInstance3D.new() var mi := MeshInstance3D.new()
@@ -71,7 +75,10 @@ func _build() -> void:
func _height(noise: FastNoiseLite, x: float, z: float) -> float: func _height(noise: FastNoiseLite, x: float, z: float) -> float:
return noise.get_noise_2d(x, z) * height_scale return noise.get_noise_2d(x, z) * height_scale
func _add_tri(st: SurfaceTool, a: Vector3, b: Vector3, c: Vector3) -> void: func _add_tri(st: SurfaceTool, a: Vector3, b: Vector3, c: Vector3, half: float, uv_scale: float) -> void:
st.set_uv(Vector2((a.x + half) * uv_scale, (a.z + half) * uv_scale))
st.add_vertex(a) st.add_vertex(a)
st.set_uv(Vector2((b.x + half) * uv_scale, (b.z + half) * uv_scale))
st.add_vertex(b) st.add_vertex(b)
st.set_uv(Vector2((c.x + half) * uv_scale, (c.z + half) * uv_scale))
st.add_vertex(c) st.add_vertex(c)