Lava and water shaders

3D/TrenchBroom/EntityScripts/Solid/acidarea.gd

@@ -3,8 +3,6 @@ class_name AcidArea
 extends Area3D
 
 const _ACID_SHADER := preload("res://Shaders/Acid.gdshader")
-# Replace this path with your actual noise texture resource once you have one saved on disk.
-# A NoiseTexture2D saved as a .tres file works well here.
 const _NOISE_TEX_PATH := "res://Shaders/acid_noise.tres"
 
 func _init() -> void:
@@ -24,12 +22,10 @@ func _apply_shader_to_mesh(mesh_instance: MeshInstance3D, noise_tex: NoiseTextur
 	if surface_count == 0 and mesh_instance.mesh != null:
 		surface_count = mesh_instance.mesh.get_surface_count()
 	for i in range(surface_count):
-		# Grab the texture func_godot baked into the surface before we replace the material
 		var existing_tex: Texture2D = null
 		var existing_mat := mesh_instance.mesh.surface_get_material(i) as BaseMaterial3D
 		if existing_mat != null:
 			existing_tex = existing_mat.albedo_texture
-
 		var mat := ShaderMaterial.new()
 		mat.shader = _ACID_SHADER
 		if existing_tex != null:

Shaders/Acid.gdshader

@@ -1,44 +1,34 @@
 shader_type spatial;
 
-// unshaded matches the pixel-art look of the rest of the game.
-// Opaque render mode guarantees the floor draws before any transparent Sprite3D /
-// AnimatedSprite3D, which are always sorted into the transparent queue after opaque geo.
 render_mode unshaded, depth_draw_opaque, cull_back;
 
-// Texture carried over from the TrenchBroom surface material by acidarea.gd.
-// hint_default_white means a flat white is used if nothing is assigned, so
-// acid_color alone still produces a visible result.
 uniform sampler2D albedo_tex : source_color, filter_nearest, repeat_enable, hint_default_white;
-// Grayscale noise for UV distortion and bubble pulse. Falls back to white (no distortion).
 uniform sampler2D noise_tex : hint_default_white, filter_linear_mipmap, repeat_enable;
 
 uniform vec4 acid_color : source_color = vec4(0.2, 0.85, 0.1, 1.0);
-uniform vec2 flow_direction = vec2(0.3, 0.15);
-// How strongly the noise warps the UV coords
 uniform float distortion_strength = 0.04;
-// Additive glow tint strength (0 = no glow)
 uniform float emission_energy = 0.4;
+// How fast the goo undulates — lower = lazier/thicker
+uniform float speed = 0.4;
 
 void fragment() {
 	vec2 uv = UV;
-	float t = TIME;
+	float t = TIME * speed;
 
-	// Sample noise at two offsets to build a swirling distortion field
-	vec2 noise_uv_a = uv * 0.5 + vec2(t * 0.05, t * 0.03);
-	vec2 noise_uv_b = uv * 0.5 + vec2(-t * 0.04, t * 0.06);
+	// Two noise layers scrolling in opposite diagonal directions.
+	// They fight each other so there's no net flow, just churning.
+	vec2 noise_uv_a = uv * 0.5 + vec2( t * 0.6,  t * 0.4);
+	vec2 noise_uv_b = uv * 0.5 + vec2(-t * 0.5, -t * 0.7);
 	float noise_a = texture(noise_tex, noise_uv_a).r;
 	float noise_b = texture(noise_tex, noise_uv_b).r;
-	vec2 distortion = vec2(noise_a, noise_b) * 2.0 - 1.0;
+	vec2 distortion = vec2(noise_a - 0.5, noise_b - 0.5) * distortion_strength;
 
-	vec2 scrolled_uv = uv + flow_direction * t + distortion * distortion_strength;
-
-	vec4 tex_color = texture(albedo_tex, scrolled_uv);
+	vec4 tex_color = texture(albedo_tex, uv + distortion);
 	vec3 final_color = tex_color.rgb * acid_color.rgb;
 
-	// Subtle additive glow pulsing with noise so the surface looks alive
-	float bubble_pulse = texture(noise_tex, uv * 0.3 + vec2(t * 0.1)).r;
-	final_color += final_color * emission_energy * (0.7 + 0.3 * bubble_pulse);
+	// Slow breathing glow from a third noise layer
+	float breathe = texture(noise_tex, uv * 0.3 + vec2(t * 0.3, t * 0.2)).r;
+	final_color += final_color * emission_energy * (0.6 + 0.4 * breathe);
 
 	ALBEDO = final_color;
 }
-

Shaders/Water.gdshader

@@ -0,0 +1,44 @@
+shader_type spatial;
+
+// unshaded matches the pixel-art look of the rest of the game.
+// Opaque render mode guarantees the floor draws before any transparent Sprite3D /
+// AnimatedSprite3D, which are always sorted into the transparent queue after opaque geo.
+render_mode unshaded, depth_draw_opaque, cull_back;
+
+// Texture carried over from the TrenchBroom surface material by acidarea.gd.
+// hint_default_white means a flat white is used if nothing is assigned, so
+// acid_color alone still produces a visible result.
+uniform sampler2D albedo_tex : source_color, filter_nearest, repeat_enable, hint_default_white;
+// Grayscale noise for UV distortion and bubble pulse. Falls back to white (no distortion).
+uniform sampler2D noise_tex : hint_default_white, filter_linear_mipmap, repeat_enable;
+
+uniform vec4 acid_color : source_color = vec4(0.2, 0.85, 0.1, 1.0);
+uniform vec2 flow_direction = vec2(0.3, 0.15);
+// How strongly the noise warps the UV coords
+uniform float distortion_strength = 0.04;
+// Additive glow tint strength (0 = no glow)
+uniform float emission_energy = 0.4;
+
+void fragment() {
+	vec2 uv = UV;
+	float t = TIME;
+
+	// Sample noise at two offsets to build a swirling distortion field
+	vec2 noise_uv_a = uv * 0.5 + vec2(t * 0.05, t * 0.03);
+	vec2 noise_uv_b = uv * 0.5 + vec2(-t * 0.04, t * 0.06);
+	float noise_a = texture(noise_tex, noise_uv_a).r;
+	float noise_b = texture(noise_tex, noise_uv_b).r;
+	vec2 distortion = vec2(noise_a, noise_b) * 2.0 - 1.0;
+
+	vec2 scrolled_uv = uv + flow_direction * t + distortion * distortion_strength;
+
+	vec4 tex_color = texture(albedo_tex, scrolled_uv);
+	vec3 final_color = tex_color.rgb * acid_color.rgb;
+
+	// Subtle additive glow pulsing with noise so the surface looks alive
+	float bubble_pulse = texture(noise_tex, uv * 0.3 + vec2(t * 0.1)).r;
+	final_color += final_color * emission_energy * (0.7 + 0.3 * bubble_pulse);
+
+	ALBEDO = final_color;
+}
+

Shaders/Water.gdshader.uid

@@ -0,0 +1 @@
+uid://bcvnkf60t6yam