herronelou

inline float3 uv_to_sphere(const float2 uv, const float2 image_size)
{
  float2 st = (uv+float2(0.5f)) / image_size;
  float latitude = (st.y - 0.5f) * PI;
  float longitude = (st.x - 0.5f) * 2 * PI;
  float radiusAtLat = cos(latitude);
  float3 normal;
  normal.x = radiusAtLat * cos(longitude);
  normal.y = sin(latitude);
  normal.z = radiusAtLat * sin(longitude);

herronelou

Group {
 name Point_Radial_Force
 label "\[value strength]"
 selected true
 xpos 490
 ypos -269
 addUserKnob {20 User}
 addUserKnob {7 strength l Strength}
 strength -1
}