Update shader.frag

Author: jcponce

sketches/shaders/box-space/shader.frag

@@ -82,10 +82,14 @@ void main() {
 
     vec2 uv = ( coord * 2.0 - 1.0 ) * iResolution.xy / iResolution.y;
 
+    vec2 mousePrevious = vec2(0.0, 0.0);
     vec2 m = (iMouse.xy * 2. - iResolution.xy) / iResolution.y;
 
+    mousePrevious = m;
 		// Default circular motion if mouse not clicked
-    if(!iView) m = vec2(-1.0, 0.0); 
+    if(!iView) {
+      m = mousePrevious;
+    }  
 
     vec3 ro = vec3(0.0, 0.0, -3.0); // ray origin
     vec3 rd = normalize(vec3(uv, 1.0)); // ray direction