Linux Certif

Toute la documentation sur la certification Linux LPI

distance.3Cg

NAME

distance - return the Euclidean distance between two points

SYNOPSIS

   float distance(float pt1, float pt2);
   float distance(float1 pt1, float1 pt2);
   float distance(float2 pt1, float2 pt2);
   float distance(float3 pt1, float3 pt2);
   float distance(float4 pt1, float4 pt2);
 
 
 

   half distance(half pt1, half pt2);
   half distance(half1 pt1, half1 pt2);
   half distance(half2 pt1, half2 pt2);
   half distance(half3 pt1, half3 pt2);
   half distance(half4 pt1, half4 pt2);
 
 
 

   fixed distance(fixed pt1, fixed pt2);
   fixed distance(fixed1 pt1, fixed1 pt2);
   fixed distance(fixed2 pt1, fixed2 pt2);
   fixed distance(fixed3 pt1, fixed3 pt2);
   fixed distance(fixed4 pt1, fixed4 pt2);
 
 
 

PARAMETERS

pt1

First point.

pt2

Second point.

DESCRIPTION

Returns the Euclidean distance from a first point pt1 to a second point pt2.

REFERENCE IMPLEMENTATION

distance for a float3 vector could be implemented like this.

   float distance(float3 pt1, float3 pt2)
   {
     float3 v = vt2 - pt1;
     return sqrt(dot(v,v));
   }
 
 
 

PROFILE SUPPORT

distance is supported in all profiles except fp20.

SEE ALSO

dot, length, normalize, sqrt