GPU Pro 4

3. A Pipeline for Authored Structural Damage 313

extern float damageBitArray[16]; // Set to maximum size needed .

VS_OUTPUT VS_Main ( VS_INPUT In)

{

.

.

.

// Check whether this vertex belongs to a " damaged " area .

// Damage ID is compressed with vertex normal .

float damageID = round (length (In. normal ))-1;

if ( damageID > 0)

{

// Assume a single- precision floating -point number

// can represent an integer number of about 24 bits.

float bitArrayIndex;

damageID = modf (( damageID -1)/24 , bitArrayIndex) * 24;

float damageBitField = damageBitArray[bitArrayIndex];

float damaged = checkBit ( damageBitField , damageID );

In. position *= 1.0f- damaged ; // Collapse ...