Advanced Rendering | Screen-Aligned Billboards

Screen-Aligned Billboards

Given a program that renders a candle with a halo. The camera rotates around the candle. The halo geometry is a two-sided collapsed quad. Each vertex of the quad have a unique index attribute ranging from 0 to 3. Modify the program to expand the halo with a size of 0.5 and make it always face the viewer.

Previous Next

vertex.glsl fragment.glsl .properties

uniform mat4 modelMatrix;

uniform mat4 viewMatrix;

uniform mat4 projectionMatrix;

in int index;

in vec3 position;

in vec2 uv;

out vec2 vUv;

void main() {

vUv = uv;

gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4(position, 1.0);

}

Expected

Output