nrm - ps

  • Article

Normalize a 3D vector.

Syntax

nrm dst, src

 

where

  • dst is the destination register.
  • src is a source register.

Remarks

Pixel shader versions 1_1 1_2 1_3 1_4 2_0 2_x 2_sw 3_0 3_sw
nrm x x x x x

 

This instruction works conceptually as shown here.

squareRootOfTheSum = (src0.x*src0.x + src0.y*src0.y + src0.z*src0.z)1/2;

dest.x = src0.x * (1 / squareRootOfTheSum);
dest.y = src0.y * (1 / squareRootOfTheSum);
dest.z = src0.z * (1 / squareRootOfTheSum);
dest.w = src0.w * (1 / squareRootOfTheSum);

The dest and src registers cannot be the same. The dest register must be a temporary register.

This instruction performs the linear interpolation based on the following formula.

float f = src0.x*src0.x + src0.y*src0.y + src0.z*src0.z;
if (f != 0)
    f = (float)(1/sqrt(f));
else
    f = FLT_MAX;

dest.x = src0.x*f;
dest.y = src0.y*f;
dest.z = src0.z*f;
dest.w = src0.w*f;

Pixel Shader Instructions