Zero gap particle trail

With the power of 2 gpu particle nodes it’s possible to emit particles for a sub emitter using a particle shader and do nothing with the main emitter lol

First image is the meat of the code that does all the work and second image is your typical particle setup which has your usual gaps at high speeds by itself

The provided scene file contains everything you need just make it a child to a node you want it to follow and it just works

The 10000 particles is just a placeholder and this works with far less depending on how much you can compromise on the speed of the object the trail is attached to and more importantly the spacing (more spacing = less particles needed)

Shader code

shader_type particles;

void start() {
	CUSTOM.xyz = EMISSION_TRANSFORM[3].xyz;
}

void process() {
	float spacing = 0.125;
	
	for (int i = 0; i < int(distance(EMISSION_TRANSFORM[3].xyz, CUSTOM.xyz) / spacing); i++) {
		CUSTOM.xyz += normalize(EMISSION_TRANSFORM[3].xyz - CUSTOM.xyz) * spacing;
		
		mat4 custom_transform = mat4(1.0);
		custom_transform[3].xyz = CUSTOM.xyz;
		emit_subparticle(custom_transform, vec3(0.0), vec4(0.0), vec4(0.0), FLAG_EMIT_POSITION);
	}
}