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Topic Starter Topic: VectorToScreen tools for QuakeIII
Hxrmn
Gibblet
Gibblet
Joined: 10 Jun 2010
Posts: 17
PostPosted: 08-08-2010 05:53 PM           Profile Send private message  E-mail  Edit post Reply with quote


Project 3D vectors to 2D screen space! :D

It took me a while to figure this stuff out, here's the code so you don't have to.
http://pastebin.com/CKkdDTfm

You'll want to put this code in your cg_local.h depending on what functions you want to use:
Code:
//
//cg_project.c
//
void VectorToScreen(vec3_t vector, refdef_t def, vec3_t out, qboolean screenScale);
qboolean quickProject(vec3_t v, float *x, float *y);
void BoundingBoxPoints(vec3_t origin, vec3_t mins, vec3_t maxs, vec3_t nodes[8]);
void CompareMins(vec3_t pmins, vec3_t cmins, vec3_t out);
void CompareMaxs(vec3_t pmaxs, vec3_t cmaxs, vec3_t out);
void RotateFoxAxis(vec3_t v, vec3_t axis[3]);
qboolean ProjectBounds( vec3_t mins, vec3_t maxs, vec3_t origin, float *xv, float *yv);
qboolean ProjectRotatedBounds( vec3_t mins, vec3_t maxs, vec3_t axis[3], float *xv, float *yv, vec3_t origin );


Here's how you use it:
Code:
VectorToScreen(vec3_t vector, refdef_t refdef, vec3_t out, qboolean screenScale);
//if screenScale is true the size of the refdef will be converted from the renderer screen size.

Alternatively you can use:
Code:
qboolean quickProject(vec3_t v, float *x, float *y);
//The refdef is cg.refdef and it returns true if the point is visible on the screen.
//Pass in a float pointer for *x and *y


This code also includes some other useful functions:

BoundingBoxPoints fills out nodes[8] with the 8 vectors that make up the box.
ProjectBounds and ProjectRotatedBounds out *xv, *yv with the 8 projected values that make up the box.
Pass in an 8 float array for *xv, *yv

So have fun and make some cool stuff.
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JPL
Gibblet
Gibblet
Joined: 10 Nov 2007
Posts: 13
PostPosted: 08-21-2010 01:28 PM           Profile Send private message  E-mail  Edit post Reply with quote


Really cool, thanks for sharing this! I'll probably get around to integrating this into my project at some point.
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