void CParametricSurface::Vertex(Vec2 domain)
{
Vec3 p0, p1, p2, p3;
Vec3 normal;
float u = domain.x;
float v = domain.y;
Eval(domain, p0);
Vec2 z1(u + du/2, v);
Eval(z1, p1);
Vec2 z2(u + du/2 + du, v);
Eval(z2, p3);
if (flipped) {
Vec2 z3(u + du/2, v - dv);
Eval(z3, p2);
} else {
Vec2 z4(u + du/2, v + dv);
Eval(z4, p2);
}
const float epsilon = 0.00001f;
Vec3 tangent = p3 - p1;
Vec3 binormal = p2 - p1;
MatrixVec3CrossProduct(normal, tangent, binormal);
if (normal.length() < epsilon)
normal = p0;
normal.normalize();
if (tangent.length() < epsilon)
MatrixVec3CrossProduct(tangent, binormal, normal);
tangent.normalize();
binormal.normalize();
binormal = binormal * -1.0f;
/*
if (CustomAttributeLocation() != -1)
glVertexAttrib1f(CustomAttributeLocation(), CustomAttributeValue(domain));
*/
//glNormal(normal);
//glTexCoord(domain);
//glVertex(p0);
int vertexIndex = totalVertex * 14;
vertexBuffer[vertexIndex++] = p0.x;
vertexBuffer[vertexIndex++] = p0.y;
vertexBuffer[vertexIndex++] = p0.z;
vertexBuffer[vertexIndex++] = domain.x;
vertexBuffer[vertexIndex++] = domain.y;
vertexBuffer[vertexIndex++] = normal.x;
vertexBuffer[vertexIndex++] = normal.y;
vertexBuffer[vertexIndex++] = normal.z;
vertexBuffer[vertexIndex++] = tangent.x;
vertexBuffer[vertexIndex++] = tangent.y;
vertexBuffer[vertexIndex++] = tangent.z;
vertexBuffer[vertexIndex++] = binormal.x;
vertexBuffer[vertexIndex++] = binormal.y;
vertexBuffer[vertexIndex++] = binormal.z;
}
void SimpleCamera::strafe(const float_t steps)
{
Vec3 sideDir;
MatrixVec3CrossProduct(sideDir, _direction, _up);
_position += (sideDir * _maxForwardVelocity * steps);
_hasChangedParameters = true;
}
void MatrixLookAtRH(
MATRIX &mOut,
const VECTOR3 &vEye,
const VECTOR3 &vAt,
const VECTOR3 &vUp)
{
VECTOR3 f, vUpActual, s, u;
MATRIX t;
f.x = vAt.x - vEye.x;
f.y = vAt.y - vEye.y;
f.z = vAt.z - vEye.z;
MatrixVec3Normalize(f, f);
MatrixVec3Normalize(vUpActual, vUp);
MatrixVec3CrossProduct(s, f, vUpActual);
MatrixVec3CrossProduct(u, s, f);
mOut.f[ 0] = s.x;
mOut.f[ 1] = u.x;
mOut.f[ 2] = -f.x;
mOut.f[ 3] = 0;
mOut.f[ 4] = s.y;
mOut.f[ 5] = u.y;
mOut.f[ 6] = -f.y;
mOut.f[ 7] = 0;
mOut.f[ 8] = s.z;
mOut.f[ 9] = u.z;
mOut.f[10] = -f.z;
mOut.f[11] = 0;
mOut.f[12] = 0;
mOut.f[13] = 0;
mOut.f[14] = 0;
mOut.f[15] = 1;
MatrixTranslation(t, -vEye.x, -vEye.y, -vEye.z);
MatrixMultiply(mOut, t, mOut);
}
