void nebu_Camera_GetRotationMatrix(nebu_Matrix4D *matrix,
const nebu_Camera *pCamera) {
vec3 x, y, z;
vec3_Sub(&z, &pCamera->vEye, &pCamera->vLookAt);
vec3_Normalize(&z, &z);
vec3_Cross(&x, &pCamera->vUp, &z);
vec3_Normalize(&x, &x);
vec3_Cross(&y, &z, &x);
vec3_Normalize(&y, &y);
#define M(row,col) matrix->m[col*4+row]
M(0,0) = x.v[0];
M(0,1) = x.v[1];
M(0,2) = x.v[2];
M(0,3) = 0.0;
M(1,0) = y.v[0];
M(1,1) = y.v[1];
M(1,2) = y.v[2];
M(1,3) = 0.0;
M(2,0) = z.v[0];
M(2,1) = z.v[1];
M(2,2) = z.v[2];
M(2,3) = 0.0;
M(3,0) = 0.0;
M(3,1) = 0.0;
M(3,2) = 0.0;
M(3,3) = 1.0;
#undef M
return;
}
static void doLookAt(const float *cam, const float *target, const float *up) {
matrix m;
vec3 x, y, z;
vec3_Sub(&z, (vec3*) cam, (vec3*) target);
vec3_Normalize(&z, &z);
vec3_Cross(&x, (vec3*) up, &z);
vec3_Normalize(&x, &x);
vec3_Cross(&y, &z, &x);
vec3_Normalize(&y, &y);
#define M(row,col) m.m[col*4+row]
M(0,0) = x.v[0];
M(0,1) = x.v[1];
M(0,2) = x.v[2];
M(0,3) = 0.0;
M(1,0) = y.v[0];
M(1,1) = y.v[1];
M(1,2) = y.v[2];
M(1,3) = 0.0;
M(2,0) = z.v[0];
M(2,1) = z.v[1];
M(2,2) = z.v[2];
M(2,3) = 0.0;
M(3,0) = 0.0;
M(3,1) = 0.0;
M(3,2) = 0.0;
M(3,3) = 1.0;
#undef M
glMultMatrixf( m.m );
/* Translate Eye to Origin */
glTranslatef( -cam[0], -cam[1], -cam[2]);
}
static void drawSpires(float radius) {
int i;
vec3 right, left;
vec3 zUnit = { { 0, 0, 1} };
vec3 vectors[NUM_SPIRES] = {
{ { 1.00f, 0.20f, 0.00f } },
{ { 0.80f, 0.25f, 0.00f } },
{ { 0.90f, 0.50f, 0.00f } },
{ { 0.70f, 0.50f, 0.00f } },
{ { 0.52f, 0.45f, 0.00f } },
{ { 0.65f, 0.75f, 0.00f } },
{ { 0.42f, 0.68f, 0.00f } },
{ { 0.40f, 1.02f, 0.00f } },
{ { 0.20f, 0.90f, 0.00f } },
{ { 0.08f, 0.65f, 0.00f } },
{ { 0.00f, 1.00f, 0.00f } }, /* vertical spire */
{ { -0.08f, 0.65f, 0.00f } },
{ { -0.20f, 0.90f, 0.00f } },
{ { -0.40f, 1.02f, 0.00f } },
{ { -0.42f, 0.68f, 0.00f } },
{ { -0.65f, 0.75f, 0.00f } },
{ { -0.52f, 0.45f, 0.00f } },
{ { -0.70f, 0.50f, 0.00f } },
{ { -0.90f, 0.50f, 0.00f } },
{ { -0.80f, 0.30f, 0.00f } },
{ { -1.00f, 0.20f, 0.00f } }
};
glColor3f(1, 1, 1);
glVertex3f(0, 0, 0);
glBlendFunc(GL_ONE, GL_ONE);
glBegin(GL_TRIANGLES);
for (i=0; i < NUM_SPIRES; i++) {
vec3_Cross(&right, vectors + i, &zUnit);
vec3_Normalize(&right, &right);
vec3_Scale(&right, &right, SPIRE_WIDTH);
vec3_Cross(&left, &zUnit, vectors + i);
vec3_Normalize(&left, &left);
vec3_Scale(&left, &left, SPIRE_WIDTH);
glColor4f(1,1,1,0.0);
glVertex3fv(right.v);
glVertex3f(radius * vectors[i].v[0], radius * vectors[i].v[1], 0.0);
glVertex3fv(left.v);
}
glEnd();
}
void nebu_Camera_Zoom(nebu_Camera *pCamera, float d) {
vec3 v;
vec3_Sub(&v, &pCamera->vLookAt, &pCamera->vEye);
vec3_Normalize(&v, &v);
vec3_Scale(&v, &v, d);
vec3_Add(&pCamera->vEye, &pCamera->vEye, &v);
}
void nebu_Camera_Roll(nebu_Camera *pCamera, float d) {
vec3 v;
matrix m;
vec3_Sub(&v, &pCamera->vLookAt, &pCamera->vEye);
vec3_Normalize(&v, &v);
matrixRotationAxis(&m, d * 2 * (float)M_PI / 360.0f, &v);
vec3_Transform(&pCamera->vUp, &pCamera->vUp, &m);
}
void nebu_Camera_Slide(nebu_Camera *pCamera, float dx, float dy, float dz)
{
vec3 vLook, vUp, vRight, vMovement;
vec3_Sub(&vLook, &pCamera->vLookAt, &pCamera->vEye);
vec3_Cross(&vRight, &vLook, &pCamera->vUp);
vec3_Cross(&vUp, &vRight, &vLook);
vec3_Normalize(&vUp, &vUp);
vec3_Normalize(&vRight, &vRight);
vec3_Normalize(&vLook, &vLook);
vec3_Scale(&vUp, &vUp, dy);
vec3_Scale(&vRight, &vRight, dx);
vec3_Scale(&vLook, &vLook, dz);
vec3_Add(&vMovement, &vUp, &vRight);
vec3_Add(&vMovement, &vMovement, &vLook);
vec3_Add(&pCamera->vEye, &pCamera->vEye, &vMovement);
vec3_Add(&pCamera->vLookAt, &pCamera->vLookAt, &vMovement);
}
int playerVisible(int eyePlayer, int targetPlayer) {
vec3 v1, v2, tmp;
float s;
float d;
int i;
int lod_level;
float x, y;
vec3_Sub(&v1, (vec3*) gPlayerVisuals[eyePlayer].camera.target, (vec3*) gPlayerVisuals[eyePlayer].camera.cam);
vec3_Normalize(&v1, &v1);
getPositionFromData(&x, &y, game->player[targetPlayer].data);
tmp.v[0] = x;
tmp.v[1] = y;
tmp.v[2] = 0;
lod_level = (gSettingsCache.lod > MAX_LOD_LEVEL) ?
MAX_LOD_LEVEL : gSettingsCache.lod;
/* calculate lod */
vec3_Sub(&v2, (vec3*) &gPlayerVisuals[eyePlayer].camera.cam, &tmp);
d = vec3_Length(&v2);
for(i = 0; i < LC_LOD && d >= lod_dist[lod_level][i]; i++);
if(i >= LC_LOD)
return -1;
vec3_Sub(&v2, &tmp, (vec3*) gPlayerVisuals[eyePlayer].camera.cam);
vec3_Normalize(&v2, &v2);
s = vec3_Dot(&v1, &v2);
/* maybe that's not exactly correct, but I didn't notice anything */
d = cosf((gSettingsCache.fov / 2) * 2 * PI / 360.0);
/*
printf("v1: %.2f %.2f %.2f\nv2: %.2f %.2f %.2f\ns: %.2f d: %.2f\n\n",
v1[0], v1[1], v1[2], v2[0], v2[1], v2[2],
s, d);
*/
if(s < d-(((gltron_Mesh*)resource_Get(gpTokenLightcycles[i], eRT_GLtronTriMesh))->BBox.fRadius*2))
return -1;
else
return i;
}
int playerVisible(Player *eye, Player *target) {
vec3 v1, v2, tmp;
float s;
float d;
int i;
int lod_level;
float x, y;
vec3_Sub(&v1, (vec3*) eye->camera->target, (vec3*) eye->camera->cam);
vec3_Normalize(&v1, &v1);
getPositionFromData(&x, &y, target->data);
tmp.v[0] = x;
tmp.v[1] = y;
tmp.v[2] = 0;
lod_level = (gSettingsCache.lod > MAX_LOD_LEVEL) ?
MAX_LOD_LEVEL : gSettingsCache.lod;
/* calculate lod */
vec3_Sub(&v2, (vec3*) eye->camera->cam, &tmp);
d = vec3_Length(&v2);
for(i = 0; i < LC_LOD && d >= lod_dist[lod_level][i]; i++);
if(i >= LC_LOD)
return -1;
vec3_Sub(&v2, &tmp, (vec3*) eye->camera->cam);
vec3_Normalize(&v2, &v2);
s = vec3_Dot(&v1, &v2);
/* maybe that's not exactly correct, but I didn't notice anything */
d = cosf((gSettingsCache.fov / 2) * 2 * PI / 360.0);
/*
printf("v1: %.2f %.2f %.2f\nv2: %.2f %.2f %.2f\ns: %.2f d: %.2f\n\n",
v1[0], v1[1], v1[2], v2[0], v2[1], v2[2],
s, d);
*/
if(s < d-(lightcycle[i]->BBox.fRadius*2))
return -1;
else
return i;
}
Matrix4* mat4_LookAtView( const Vector3* eyePos, const Vector3* lookPos, const Vector3* up, Matrix4* out )
{
assert( out != NULL );
Vector3 u, f, s;
memcpy( out, &IDENTITY_MATRIX, sizeof( Matrix4 ) );
vec3_Subtract( lookPos, eyePos, &f );
vec3_Normalize( &f );
memcpy( &u, up, sizeof( Vector3 ) );
vec3_Normalize( &u );
vec3_CrossProd( &f, &u, &s );
vec3_Normalize( &s );
vec3_CrossProd( &s, &f, &u );
out->m[0] = s.v[0];
out->m[4] = s.v[1];
out->m[8] = s.v[2];
out->m[1] = u.v[0];
out->m[5] = u.v[1];
out->m[9] = u.v[2];
out->m[2] = -f.v[0];
out->m[6] = -f.v[1];
out->m[10] = -f.v[2];
out->m[12] = -vec3_DotProd( &s, eyePos );
out->m[13] = -vec3_DotProd( &u, eyePos );
out->m[14] = vec3_DotProd( &f, eyePos );
return out;
}
vec3* nebu_Mesh_ComputeFaceNormals(const nebu_Mesh_VB *pVB, const nebu_Mesh_IB *pIB)
{
int i;
vec3 *pNormals = (vec3*) malloc( pIB->nPrimitives * sizeof(vec3) );
for(i = 0; i < pIB->nPrimitives; i++)
{
vec3_TriNormalDirection(pNormals + i,
(vec3*) (pVB->pVertices + 3 * pIB->pIndices[ 3 * i + 0 ]),
(vec3*) (pVB->pVertices + 3 * pIB->pIndices[ 3 * i + 1 ]),
(vec3*) (pVB->pVertices + 3 * pIB->pIndices[ 3 * i + 2 ]) );
vec3_Normalize(pNormals + i, pNormals + i);
}
return pNormals;
}
void nebu_Camera_Rotate(nebu_Camera *pCamera, int flags,
float dx, float dy)
{
// adjust up vector, so that it is orthogonal to
// view direction
vec3 vDiff, vView, vRight, vUp;
vec3 vdx, vdy;
vec3 *pvCenter, *pvMoving;
switch(flags & NEBU_CAMERA_ROTATE_MASK)
{
case NEBU_CAMERA_ROTATE_AROUND_EYE:
pvCenter = &pCamera->vEye;
pvMoving = &pCamera->vLookAt;
break;
case NEBU_CAMERA_ROTATE_AROUND_LOOKAT:
pvCenter = &pCamera->vLookAt;
pvMoving = &pCamera->vEye;
break;
default:
assert(0);
return;
}
vec3_Sub(&vDiff, pvCenter, pvMoving);
vec3_Normalize(&vView, &vDiff);
vec3_Cross(&vRight, &pCamera->vUp, &vView);
vec3_Normalize(&vRight, &vRight);
vec3_Cross(&vUp, &vView, &vRight);
vec3_Normalize(&vUp, &vUp);
// horizontal movement (dx):
if(dx == 0) {
vec3_Zero(&vdx);
} else {
// rotate moving around up vector through center point
vec3 v = vDiff;
float fAngle = dx * 2 * (float)M_PI / 360.0f;
matrix matRotation;
matrixRotationAxis(&matRotation, fAngle, &vUp);
vec3_Transform(&v, &vDiff, &matRotation);
vec3_Sub(&vdx, &v, &vDiff);
}
// vertical movement (dy):
if(dy == 0) {
vec3_Zero(&vdy);
} else {
// rotate eye point around up vector through lookAt point
vec3 v = vDiff;
float fAngle = dy * 2 * (float)M_PI / 360.0f;
matrix matRotation;
matrixRotationAxis(&matRotation, fAngle, &vRight);
vec3_Transform(&v, &vDiff, &matRotation);
vec3_Sub(&vdy, &v, &vDiff);
matrixTranspose(&matRotation, &matRotation);
if(!(flags & NEBU_CAMERA_FIXED_UP))
vec3_Transform(&pCamera->vUp, &pCamera->vUp, &matRotation);
}
{
vec3 v;
vec3_Add(&v, &vdx, &vdy);
vec3_Add(&v, &v, pvMoving);
vec3_Sub(&v, &v, pvCenter);
vec3_Normalize(&v, &v);
// printf("up dot view: %.4f\n", - vec3_Dot(&v, &pCamera->vUp));
vec3_Scale(&v, &v, vec3_Length(&vDiff));
vec3_Add(pvMoving, &v, pvCenter);
}
}
void drawCam(int player) {
int i;
float up[3] = { 0, 0, 1 };
Visual *d = & gPlayerVisuals[player].display;
float reflectivity = getReflectivity();
// compute shadow color based on glocal constant & reflectivity
for(i = 0; i < 4; i++)
gCurrentShadowColor[i] = gShadowColor[i] * (1 - reflectivity);
glColor3f(0.0, 1.0, 0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
doPerspective(gSettingsCache.fov, (float) d->vp_w / (float) d->vp_h,
gSettingsCache.znear, box2_Diameter(& game2->level->boundingBox) * 6.5f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
{
vec3 vLookAt;
vec3 vTarget;
matrix matRotate;
vec3_Sub(&vLookAt, (vec3*)gPlayerVisuals[player].camera.target, (vec3*)gPlayerVisuals[player].camera.cam);
vec3_Normalize(&vLookAt, &vLookAt);
matrixRotationAxis(&matRotate, 90.0f * (float) gPlayerVisuals[player].camera.bIsGlancing, (vec3*)up);
vec3_Transform(&vLookAt, &vLookAt, &matRotate);
vec3_Add(&vTarget, (vec3*)gPlayerVisuals[player].camera.cam, &vLookAt);
doLookAt(gPlayerVisuals[player].camera.cam, (float*)&vTarget, up);
}
glDisable(GL_LIGHTING); // initial config at frame start
glDisable(GL_BLEND); // initial config at frame start
// disable writes to alpha
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE);
/* skybox */
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
drawSkybox( box2_Diameter( & game2->level->boundingBox ) * 2.5f );
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
/* skybox done */
/* floor */
if(reflectivity == 0) {
// draw floor to fb and stencil (set to 1),
// using alpha-blending
// TODO: draw floor alpha to fb
video_Shader_Setup(& gWorld->floor_shader);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilFunc(GL_ALWAYS, 1, 255);
glEnable(GL_STENCIL_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
nebu_Mesh_DrawGeometry( gWorld->floor );
glDisable(GL_BLEND);
glDisable(GL_STENCIL_TEST);
video_Shader_Cleanup(& gWorld->floor_shader);
} else {
/* reflections */
/* first draw reflector to stencil */
/* and reflector alpha to fb */
video_Shader_Setup(& gWorld->floor_shader);
// store only reflector alpha in framebuffer
glDepthMask(GL_FALSE);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilFunc(GL_ALWAYS, 1, 255);
glEnable(GL_STENCIL_TEST);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
// glEnable(GL_ALPHA_TEST);
// glAlphaFunc(GL_GREATER, 0.1f);
nebu_Mesh_DrawGeometry( gWorld->floor );
// glDisable(GL_ALPHA_TEST);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glDepthMask(GL_TRUE);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilFunc(GL_EQUAL, 1, 255);
video_Shader_Cleanup(& gWorld->floor_shader);
/* then draw world & skybox reflected, where stencil is set */
/* protect the alpha buffer */
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE);
isRenderingReflection = 1; // hack: reverse lighting
glPushMatrix();
glScalef(1,1,-1);
glCullFace(GL_FRONT); // reverse culling
// clip skybox & world to floor plane
glEnable(GL_CLIP_PLANE0);
{
double plane[] = { 0, 0, 1, 0 };
glClipPlane(GL_CLIP_PLANE0, plane);
}
drawSkybox( box2_Diameter( & game2->level->boundingBox ) * 2.5f );
drawWorld(player);
glDisable(GL_CLIP_PLANE0);
glCullFace(GL_BACK);
glPopMatrix();
isRenderingReflection = 0; // hack: normal lighting
/* then blend the skybox into the scene, where stencil is set */
/* modulate with the destination alpha */
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
drawSkybox( box2_Diameter( & game2->level->boundingBox ) * 2.5f );
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
/* then blend reflector into the scene */
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(1, 1, 1, 1 - reflectivity);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilFunc(GL_ALWAYS, 1, 255);
video_Shader_Setup(& gWorld->floor_shader);
nebu_Mesh_DrawGeometry( gWorld->floor );
video_Shader_Cleanup(& gWorld->floor_shader);
glDisable(GL_STENCIL_TEST);
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
}
/* floor done */
/* planar shadows */
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
if(reflectivity != 1) // there are no shadows on perfect mirrors
drawPlanarShadows(player);
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
/* planar shadows done */
drawWorld(player);
/* transparent stuff */
/* draw the glow around the other players: */
if (gSettingsCache.show_glow == 1) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
for (i = 0; i < game->players; i++)
{
if (i != player && PLAYER_IS_ACTIVE(game->player + i))
{
drawGlow(&gPlayerVisuals[player].camera, game->player + i, gPlayerVisuals + i,
d, TRAIL_HEIGHT * 4);
}
}
glDisable(GL_BLEND);
}
}
void ai_getConfig(int player, int target,
AI_Configuration *config) {
Data *data;
getPositionFromIndex(config->player.vStart.v + 0,
config->player.vStart.v + 1,
player);
getPositionFromIndex(config->opponent.vStart.v + 0,
config->opponent.vStart.v + 1,
target);
data = game->player[player].data;
config->player.vDirection.v[0] = dirsX[ data->dir ] * data->speed;
config->player.vDirection.v[1] = dirsY[ data->dir ] * data->speed;
data = game->player[target].data;
config->opponent.vDirection.v[0] = dirsX[ data->dir ] * data->speed;
config->opponent.vDirection.v[1] = dirsY[ data->dir ] * data->speed;
// compute sector
{
vec2 diff;
vec3 v1, v2, v3;
vec3 up = { { 0, 0, 1 } };
float cosphi;
float phi;
int i;
vec2_Sub(&diff, &config->player.vStart, &config->opponent.vStart);
v1.v[0] = diff.v[0];
v1.v[1] = diff.v[1];
v1.v[2] = 0;
v2.v[0] = config->opponent.vDirection.v[0];
v2.v[1] = config->opponent.vDirection.v[1];
v2.v[2] = 0;
vec3_Normalize(&v1, &v1);
vec3_Normalize(&v2, &v2);
vec3_Cross(&v3, &v1, &v2);
vec3_Normalize(&v3, &v3);
cosphi = vec3_Dot(&v1, &v2);
nebu_Clamp(&cosphi, -1, 1);
phi = (float) acos(cosphi);
if(vec3_Dot(&v3, &up) > 0)
phi = 2 * (float) M_PI - phi;
for(i = 0; i < 8; i++) {
phi -= (float) M_PI / 4;
if(phi < 0) {
config->location = i;
break;
}
}
}
// compute intersection
{
segment2 seg1;
segment2 seg2;
seg1.vStart = config->opponent.vStart;
seg1.vDirection = config->opponent.vDirection;
seg2.vStart = config->player.vStart;
vec2_Orthogonal( &seg2.vDirection, &config->opponent.vDirection );
vec2_Normalize( &seg2.vDirection, &seg2.vDirection );
vec2_Scale( &seg2.vDirection,
&seg2.vDirection,
vec2_Length( &config->player.vDirection )
);
segment2_Intersect( &config->intersection,
&config->t_opponent, &config->t_player,
&seg1, &seg2 );
if(config->t_player < 0)
config->t_player *= -1;
}
}
void nebu_Camera_RotateAroundTarget(nebu_Camera *pCamera,
float dx, float dy) {
// adjust up vector, so that it is orthogonal to
// view direction
vec3 vDiff, vView, vRight, vUp;
vec3 vdx, vdy;
vec3_Sub(&vDiff, &pCamera->vLookAt, &pCamera->vEye);
vec3_Normalize(&vView, &vDiff);
vec3_Cross(&vRight, &pCamera->vUp, &vView);
vec3_Normalize(&vRight, &vRight);
vec3_Cross(&vUp, &vView, &vRight);
vec3_Normalize(&vUp, &vUp);
// horizontal movement (dx):
if(dx == 0) {
vec3_Zero(&vdx);
} else {
// rotate eye point around up vector through lookAt point
vec3 v = vDiff;
float fAngle = dx * 2 * M_PI / 360.0;
matrix matRotation;
matrixRotationAxis(&matRotation, fAngle, &vUp);
vec3_Transform(&v, &vDiff, &matRotation);
vec3_Sub(&vdx, &v, &vDiff);
}
// vertical movement (dy):
if(dy == 0) {
vec3_Zero(&vdy);
} else {
// rotate eye point around up vector through lookAt point
vec3 v = vDiff;
float fAngle = dy * 2 * M_PI / 360.0;
matrix matRotation;
matrixRotationAxis(&matRotation, fAngle, &vRight);
vec3_Transform(&v, &vDiff, &matRotation);
vec3_Sub(&vdy, &v, &vDiff);
matrixTranspose(&matRotation, &matRotation);
vec3_Transform(&pCamera->vUp, &pCamera->vUp, &matRotation);
}
// add relative movements to camera position
/*
vec3_Add(&pCamera->vEye, &pCamera->vEye, &vdx);
vec3_Add(&pCamera->vEye, &pCamera->vEye, &vdy);
*/
{
vec3 v;
vec3_Add(&v, &vdx, &vdy);
vec3_Add(&v, &v, &pCamera->vEye);
vec3_Sub(&v, &v, &pCamera->vLookAt);
vec3_Normalize(&v, &v);
// printf("up dot view: %.4f\n", - vec3_Dot(&v, &pCamera->vUp));
vec3_Scale(&v, &v, vec3_Length(&vDiff));
vec3_Add(&pCamera->vEye, &v, &pCamera->vLookAt);
}
}