void RenderInputScene::SetTransform(const Drawable & d, GraphicsState & glstate)
{
if (!last_transform_valid || !last_transform.Equals(d.GetTransform()))
{
Mat4 worldTrans = d.GetTransform().Multiply(viewMatrix);
glLoadMatrixf(worldTrans.GetArray());
last_transform = d.GetTransform();
last_transform_valid = true;
}
}
static bool Cull(const Frustum & f, const Drawable & d)
{
const float radius = d.GetRadius();
Vec3 center = d.GetObjectCenter();
d.GetTransform().TransformVectorOut(center[0], center[1], center[2]);
for (int i = 0; i < 6; i++)
{
const float rd =
f.frustum[i][0] * center[0] +
f.frustum[i][1] * center[1] +
f.frustum[i][2] * center[2] +
f.frustum[i][3];
if (rd <= -radius)
return true;
}
return false;
}
bool RenderInputScene::FrustumCull(const Drawable & d) const
{
const float radius = d.GetRadius();
if (radius > 0.0)
{
// get object center in world space
Vec3 objpos = d.GetObjectCenter();
d.GetTransform().TransformVectorOut(objpos[0], objpos[1], objpos[2]);
// get distance to camera
const float dx = objpos[0] - cam_position[0];
const float dy = objpos[1] - cam_position[1];
const float dz = objpos[2] - cam_position[2];
const float rc = dx * dx + dy * dy + dz * dz;
// test against camera position (assuming near plane is zero)
if (rc < radius * radius)
return false;
// test against camera far plane
const float temp_lod_far = lod_far + radius;
if (rc > temp_lod_far * temp_lod_far)
return true;
// test against all frustum planes
for (int i = 0; i < 6; i++)
{
const float rd = frustum.frustum[i][0] * objpos[0] +
frustum.frustum[i][1] * objpos[1] +
frustum.frustum[i][2] * objpos[2] +
frustum.frustum[i][3];
if (rd <= -radius)
return true;
}
}
return false;
}
