Camera::Camera(const vec3& position, const vec3& rot, float fov) :
m_Position(position), m_Rotation(rot), m_Fov(fov)
{
auto x = -((float)FRAME_WIDTH / (float)FRAME_HEIGHT);
auto y = 1.f;
vec3 corner(x, y, 1);
vec3 center(0, 0, 1);
auto scaling = tan(radians(m_Fov * 0.5f)) / (corner - center).length();
x *= scaling;
y *= scaling;
m_RotationMatrix = CreateRotationMatrix(m_Rotation);
m_TopLeft = vec3(m_RotationMatrix * vec4(x, y, 1, 1));
m_TopRight = vec3(m_RotationMatrix * vec4(-x, y, 1, 1));
m_DownLeft = vec3(m_RotationMatrix * vec4(x, -y, 1, 1));
m_UpDir = vec3(m_RotationMatrix * vec4(0, 1, 0, 1));
m_RightDir = vec3(m_RotationMatrix * vec4(1, 0, 0, 1));
m_FrontDir = vec3(m_RotationMatrix * vec4(0, 0, 1, 1));
m_TopLeft += m_Position;
m_TopRight += m_Position;
m_DownLeft += m_Position;
}
//===========================================================================
//
// Parameter: -
// Returns: -
// Changes Globals: -
//===========================================================================
int AAS_TransformPlane(int planenum, vec3_t origin, vec3_t angles)
{
float newdist, matrix[3][3];
vec3_t normal;
//rotate the node plane
VectorCopy(mapplanes[planenum].normal, normal);
CreateRotationMatrix(angles, matrix);
RotatePoint(normal, matrix);
newdist = mapplanes[planenum].dist + DotProduct(normal, origin);
return FindFloatPlane(normal, newdist);
} //end of the function AAS_TransformPlane
/*
==================
CM_TransformedBoxTrace
Handles offseting and rotation of the end points for moving and
rotating entities
==================
*/
void CM_TransformedBoxTrace(trace_t *results, const vec3_t start, const vec3_t end,
const vec3_t mins, const vec3_t maxs,
clipHandle_t model, int brushmask,
const vec3_t origin, const vec3_t angles, int capsule)
{
trace_t trace;
vec3_t start_l, end_l;
qboolean rotated;
vec3_t offset;
vec3_t symetricSize[2];
vec3_t matrix[3], transpose[3];
int i;
float halfwidth;
float halfheight;
float t;
sphere_t sphere;
if (!mins)
{
mins = vec3_origin;
}
if (!maxs)
{
maxs = vec3_origin;
}
// adjust so that mins and maxs are always symetric, which
// avoids some complications with plane expanding of rotated bmodels
for (i = 0 ; i < 3 ; i++)
{
offset[i] = (mins[i] + maxs[i]) * 0.5;
symetricSize[0][i] = mins[i] - offset[i];
symetricSize[1][i] = maxs[i] - offset[i];
start_l[i] = start[i] + offset[i];
end_l[i] = end[i] + offset[i];
}
// subtract origin offset
VectorSubtract(start_l, origin, start_l);
VectorSubtract(end_l, origin, end_l);
// rotate start and end into the models frame of reference
if (model != BOX_MODEL_HANDLE &&
(angles[0] || angles[1] || angles[2]))
{
rotated = qtrue;
}
else
{
rotated = qfalse;
}
halfwidth = symetricSize[1][0];
halfheight = symetricSize[1][2];
sphere.use = capsule;
sphere.radius = (halfwidth > halfheight) ? halfheight : halfwidth;
sphere.halfheight = halfheight;
t = halfheight - sphere.radius;
if (rotated)
{
// rotation on trace line (start-end) instead of rotating the bmodel
// NOTE: This is still incorrect for bounding boxes because the actual bounding
// box that is swept through the model is not rotated. We cannot rotate
// the bounding box or the bmodel because that would make all the brush
// bevels invalid.
// However this is correct for capsules since a capsule itself is rotated too.
CreateRotationMatrix(angles, matrix);
RotatePoint(start_l, matrix);
RotatePoint(end_l, matrix);
// rotated sphere offset for capsule
sphere.offset[0] = matrix[0][2] * t;
sphere.offset[1] = -matrix[1][2] * t;
sphere.offset[2] = matrix[2][2] * t;
}
else
{
VectorSet(sphere.offset, 0, 0, t);
}
// sweep the box through the model
CM_Trace(&trace, start_l, end_l, symetricSize[0], symetricSize[1], model, origin, brushmask, capsule, &sphere);
// if the bmodel was rotated and there was a collision
if (rotated && trace.fraction != 1.0)
{
// rotation of bmodel collision plane
TransposeMatrix(matrix, transpose);
RotatePoint(trace.plane.normal, transpose);
}
// re-calculate the end position of the trace because the trace.endpos
// calculated by CM_Trace could be rotated and have an offset
trace.endpos[0] = start[0] + trace.fraction * (end[0] - start[0]);
trace.endpos[1] = start[1] + trace.fraction * (end[1] - start[1]);
trace.endpos[2] = start[2] + trace.fraction * (end[2] - start[2]);
*results = trace;
}