Added footsteps, new tree, various other tweaks

addons/proton_scatter/demos/assets/materials/leaves.gdshader

@@ -0,0 +1,51 @@
+shader_type spatial;
+
+render_mode depth_draw_opaque, cull_disabled;
+
+// Texture settings
+uniform sampler2D texture_albedo : hint_default_white, repeat_disable;
+uniform sampler2D texture_gradient : hint_default_white;
+uniform sampler2D texture_noise : hint_default_white;
+uniform float alpha_scissor_threshold : hint_range(0.0, 1.0);
+uniform vec4 transmission : source_color;
+uniform float total_height = 1.0;
+
+// Wind settings
+uniform vec2 wind_direction = vec2(1, -0.5);
+uniform float wind_speed = 1.0;
+uniform float wind_strength = 2.0;
+uniform float noise_scale = 20.0;
+
+varying float color;
+varying float height;
+
+void vertex() {
+	height = VERTEX.y;
+	
+	vec4 world_pos = MODEL_MATRIX * vec4(VERTEX, 1.0);
+	vec2 uv = (world_pos.xz + VERTEX.yy) / (noise_scale + 1e-2) ;
+	vec2 panning_uv = uv + fract(TIME * wind_direction * wind_speed);
+	float wind = texture(texture_noise, panning_uv).r * 2.0 - 0.4;
+	color = texture(texture_noise, uv).r;
+	
+	float wind_influence = smoothstep(0, 1, 1.0 - UV.y);
+	vec2 wind_offset = -wind_direction * wind_strength * wind_influence * wind;
+	world_pos.xz += wind_offset;
+	world_pos.y -= wind * wind_influence * wind_strength * 0.45;
+	
+	vec4 local_pos = inverse(MODEL_MATRIX) * world_pos;
+	
+	VERTEX = local_pos.xyz;
+	//NORMAL = vec3(0.0, 1.0, 0.0);
+}
+
+void fragment() {
+	vec4 tex = texture(texture_albedo, UV);
+	if (tex.a < alpha_scissor_threshold) {
+		discard;
+	}
+	
+	BACKLIGHT = transmission.rgb;
+	vec4 gradient = texture(texture_gradient, vec2(height / total_height, 0.0));
+	ALBEDO = tex.rbg * gradient.rgb;
+}