void RaycastCamera::init(u32 screenWidth, u32 screenHeight, f32 fov, f32 nearZ, f32 farZ)
{
mScreenWidth = (f32)screenWidth;
mScreenHeight = (f32)screenHeight;
mFov = fov;
mNearZ = nearZ;
mFarZ = farZ;
mAspectRatio = mScreenWidth / mScreenHeight;
mProjection = perspective(radians(60.0f),
mAspectRatio,
mNearZ,
mFarZ);
mProjectionInv = ~mProjection;
move(vec3(0.0f, 0.0f, 10.0f), quat(0, vec3(0.0f, 0.0f, -1.0f)));
vec3 rayBottomLeft = normalize(vec3(mProjectionInv * vec4(-1.0f, -1.0f, 0.0f, 1.0f)));
vec3 rayBottomRight = vec3(-rayBottomLeft.x, rayBottomLeft.y, rayBottomLeft.z);
vec3 rayTopLeft = vec3( rayBottomLeft.x, -rayBottomLeft.y, rayBottomLeft.z);
vec3 rayTopRight = vec3(-rayBottomLeft.x, -rayBottomLeft.y, rayBottomLeft.z);
f32 cosAngle = dot(rayBottomLeft, normalize(vec3(0.0f, 0.0f, mNearZ)));
f32 nearLen = -mNearZ / cosAngle;
f32 farLen = -mFarZ / cosAngle;
// calculate each corner
vec3 corBLN = rayBottomLeft * nearLen;
vec3 corBLF = rayBottomLeft * farLen;
mCornersInit[kCOR_BottomLeft].nearPos = corBLN;
mCornersInit[kCOR_BottomLeft].farPos = corBLF;
mCornersInit[kCOR_BottomRight].nearPos = vec3(-corBLN.x, corBLN.y, corBLN.z);
mCornersInit[kCOR_BottomRight].farPos = vec3(-corBLF.x, corBLF.y, corBLF.z);
mCornersInit[kCOR_TopLeft].nearPos = vec3(corBLN.x, -corBLN.y, corBLN.z);
mCornersInit[kCOR_TopLeft].farPos = vec3(corBLF.x, -corBLF.y, corBLF.z);
mCornersInit[kCOR_TopRight].nearPos = vec3(-corBLN.x, -corBLN.y, corBLN.z);
mCornersInit[kCOR_TopRight].farPos = vec3(-corBLF.x, -corBLF.y, corBLF.z);
reset();
calcPlanes();
}
void ViewFrustum::setCamParams(float _angle, float _ratio, float nearClipDist, float farClipDist, glm::vec3& pos, glm::vec3& lookAt, glm::vec3& up)
{
ratio = _ratio;
angle = _angle;
nearClip = nearClipDist;
farClip = farClipDist;
//Vyska a sirka orezovych rovin
float tang = (float)tan(angle * 0.5) ;
nearHeight = nearClip * tang;
nearWidth = nearHeight * ratio;
farHeight = farClip * tang;
farWidth = farHeight * ratio;
glm::vec3 X, Y, Z, nearClipCenter, farClipCenter;
//Base vectors calculation
//Z
Z = glm::normalize(pos - lookAt);
// X = UP x Z
X = glm::normalize(glm::cross(up, Z));//upV * ZV;
//Y = Z x X
Y = glm::normalize(glm::cross(Z, X));
//Vypocet stredov near/far plane
nearClipCenter = pos - (Z * nearClip);
farClipCenter = pos - (Z * farClip);
//Vypocet rohov VF - near plane
ntl = nearClipCenter + (Y * nearHeight) - (X * nearWidth);
ntr = nearClipCenter + (Y * nearHeight) + (X * nearWidth);
nbl = nearClipCenter - (Y * nearHeight) - (X * nearWidth);
nbr = nearClipCenter - (Y * nearHeight) + (X * nearWidth);
//Far plane
ftl = farClipCenter + (Y * farHeight) - (X * farWidth);
ftr = farClipCenter + (Y * farHeight) + (X * farWidth);
fbl = farClipCenter - (Y * farHeight) - (X * farWidth);
fbr = farClipCenter - (Y * farHeight) + (X * farWidth);
//Vypocet rovin
calcPlanes();
}
void RaycastCamera::move(const vec3 & pos, const quat & dir)
{
mPos = pos;
mDir = dir;
//mView = mat4::translation(-mPos) * mat4::transpose(mat4(mDir));
mView = mat4(-mPos) * mat4(mDir);
//mView = ~mView;
//mView.setTranslation(-pos);
// Reset points to our default unmoved positions, and
// than transform each point.
reset();
for (u32 ct = 0; ct < kCOR_COUNT; ++ct)
{
mCorners[ct].nearPos = dir * mCorners[ct].nearPos;
mCorners[ct].farPos = dir * mCorners[ct].farPos;
}
calcPlanes();
}
