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/* routines which check an object to see if it is in the player's line of sight */
extern int CameraCanSeeThisPosition_WithIgnore(DISPLAYBLOCK *ignoredObjectPtr,VECTORCH *positionPtr);
extern void CheckForViewVectorIntersectionWith3dObject(DISPLAYBLOCK *dPtr);
extern void CheckForVectorIntersectionWith3dObject(DISPLAYBLOCK *objectPtr, VECTORCH *viewVectorAlphaPtr, VECTORCH *viewVectorBetaPtr, int rigorous);
/* General line of sight routine: (written for Roxby!) */
extern int IsThisObjectVisibleFromThisPosition(DISPLAYBLOCK *objectPtr,VECTORCH *positionPtr,int maxRange);
/*KJL****************************************************
* dPtr - DISPLAYBLOCK* target *
* positionPtr - VECTORCH* co-ord from which to look *
* maxRange - int maximum range in metres to look *
****************************************************KJL*/
/* KJL 18:17:46 16/05/98 - check for an object's visibility, but ignore an object - e.g. ignore the character which is looking */
extern int IsThisObjectVisibleFromThisPosition_WithIgnore(DISPLAYBLOCK *objectPtr,DISPLAYBLOCK *ignoredObjectPtr,VECTORCH *positionPtr,int maxRange);
void FindPolygonInLineOfSight(VECTORCH *viewpointDirectionPtr, VECTORCH *viewpointPositionPtr, int useOnScreenBlockList, DISPLAYBLOCK *objectToIgnorePtr);
void FindPolygonInLineOfSight_TwoIgnores(VECTORCH *viewpointDirectionPtr, VECTORCH *viewpointPositionPtr, int useOnScreenBlockList, DISPLAYBLOCK *objectToIgnorePtr,DISPLAYBLOCK *next_objectToIgnorePtr);
/* Line Of Sight data */
extern VECTORCH LOS_Point; /* point in world space which player has hit */
extern int LOS_Lambda; /* distance in mm to point from player */
extern DISPLAYBLOCK* LOS_ObjectHitPtr; /* pointer to object that was hit */
extern VECTORCH LOS_ObjectNormal; /* normal of the object's face which was hit */
extern SECTION_DATA* LOS_HModel_Section; /* Section of HModel hit */
/*KJL**********************************************************************************
* The interface for this function is a bit muddle since it was originally a static fn *
* used by the dynamics system. *
* *
* Input: (in world space) *
* dPtr - target object (in world space) *
* viewVectorAlphaPtr - starting point of view-line *
* viewVectorBetaPtr - direction of view-line (NORMALISED) *
* *
* WARNING! the contents of the above vectors will be changed! *
* *
* also set *
* *
* LOS_ObjectHitPtr - to zero (GLOBAL VARIABLE) *
* LOS_Lambda - to max range in mm (GLOBAL VARIABLE) *
* *
* Output: *
* LOS_ObjectHitPtr - dPtr of hit object *
* LOS_Lambda - distance to hit polygon (or max if no hit) *
* LOS_Point - world space coords of intersection of line & hit poly *
* LOS_ObjectNormal - normal of the hit polygon *
**********************************************************************************KJL*/
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