Mech Gunfire Effect – Muzzleflash Shader

Gunfire muzzleflash effect for your projects, this one is about the gunfire effect, updated with inverse fresnel to fade away if viewed from the front. The gunfire smoke effect: https://godotshaders.com/shader/mech-gunfire-effect-smoke-shader/

Shader code

shader_type spatial;
render_mode blend_add,depth_draw_opaque,cull_disabled,
diffuse_toon,specular_disabled,unshaded,shadows_disabled,
ambient_light_disabled,fog_disabled;
uniform sampler2D texture_albedo : source_color,filter_linear_mipmap,repeat_enable;

uniform int particles_anim_h_frames;
uniform int particles_anim_v_frames;
//uniform bool particles_anim_loop;

void vertex() {
	float h_frames = float(particles_anim_h_frames);
	float v_frames = float(particles_anim_v_frames);
	float particle_total_frames = float(particles_anim_h_frames * particles_anim_v_frames);
	float particle_frame = floor(INSTANCE_CUSTOM.z * float(particle_total_frames));
	
	// We don't want to cycle so  the if is removed.
	particle_frame = clamp(particle_frame, 0.0, particle_total_frames - 1.0);
	//if (!particles_anim_loop) {
		//particle_frame = clamp(particle_frame, 0.0, particle_total_frames - 1.0);
	//} else {
		//particle_frame = mod(particle_frame, particle_total_frames);
	//}
	
	UV /= vec2(h_frames, v_frames);
	UV += vec2(mod(particle_frame, h_frames) / h_frames, floor((particle_frame + 0.5) / h_frames) / v_frames);
}


float fresnel(float amount, vec3 normal, vec3 view){
	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0 )), amount);
}
// The inverse fresnel is used to fade away the sprite-like geometry when viewed from the front,
// this improves the look of it and whenever is looked from the sides it get's displayed at full
// opacity, control the amount for a stronger or weaker effect.
float inverse_fresnel(float amount, vec3 normal, vec3 view){
	return pow(clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0), amount);
}

void fragment() {
	vec4 albedo_tex = texture(texture_albedo,UV);
	ALBEDO = albedo_tex.rgb * COLOR.rgb * albedo_tex.a * 4.0;
	ALPHA = (albedo_tex.a * inverse_fresnel(1.5, NORMAL, VIEW) * COLOR.a); // Fade away when looking at front view the muzzleflare using a fresnel.
	ALPHA_SCISSOR_THRESHOLD = 0.001;
}