3D Tree Sway Wind Shader v0.5
The first iteration of my wind sway shader.
Features :
Wind Speed, Wind Strength, Wind Direction, Bendiness Multiplier
Shader code
shader_type spatial;
uniform bool debug_mode = false;
uniform float wind_direction = 90.0f;
uniform float wind_strenth = 3.0f;
uniform float sway_speed = 3.0f;
uniform float bendieness_multiplier = 0.0f;
uniform sampler2D albedo_texture : source_color;
varying float wind_multiplier;
// convert degrees to a vec2 direction.
vec2 rotation_to_direction()
{
float rotation_radians = wind_direction * (3.14f / 180.0f);
vec2 direction = vec2(cos(rotation_radians), sin(rotation_radians));
return normalize(direction);
}
void vertex() {
// distance to the worlds.y 0.
vec3 world_pos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
float dist = world_pos.y;
// DEBUG: applies visual gradients.
if (debug_mode)
{
float gradient = clamp(dist * 0.2, 0.0, 1.0);
COLOR = vec4(gradient, gradient, gradient, 1.0);
}
// magic 100.0f just to make it easier to adjust in property panel
float sway = sin(TIME * sway_speed + VERTEX.y) * wind_strenth / 100.0f;
VERTEX.x += (sway * dist);
// magic 100.0f just to make it easier to adjust in property panel
vec2 wind_bending = vec2((wind_strenth / 100.0f) * dist) * rotation_to_direction();
VERTEX.xz += wind_bending * bendieness_multiplier;
}
void fragment() {
vec3 tex_color = texture(albedo_texture, UV).rgb;
if (debug_mode) {
ALBEDO = COLOR.rgb;
} else {
ALBEDO = tex_color;
}
}