larry babby and threejs for glsl

webGl/my-threejs-test/shaders/fragment.glsl

@@ -0,0 +1,19 @@
+varying vec3 vColor;
+
+void main() {
+    float distance = length(gl_PointCoord - vec2(0.5, 0.5));
+    float radius = 0.5; // The radius of the circle, where 0.5 is the edge of the point sprite
+    float intensity = 0.5; // Gaussian for smooth intensity increase
+    // float intensity = exp(-pow(distance * 3.0, 2.0)); // Gaussian for smooth intensity increase
+    
+    // If the distance is greater than the radius, discard the fragment (make it transparent)
+    if (distance > radius) {
+        discard;
+    }
+    
+    // Use the intensity to modulate the color within the circle
+    vec3 brightColor = vColor * intensity; 
+    brightColor = clamp(brightColor, 0.0, 2.5); 
+
+    gl_FragColor = vec4(brightColor, 1.0); // Full alpha within the circle
+}