Author: eilemann@gmail.com
State: Implemented in 0.2.0
Overview
This features adds support for updating the near and far plane
from Channel::draw. Updating the near and far plane changes the
channel's current frustum, which is acquired
by Channel::getFrustum or applied to the current OpenGL context
by Channel::applyFrustum.
Implementation
The current implementation, introduced in Equalizer 0.2, updates the current rendering context by setting the frustum's near and far value and by adjusting the left, right, bottom and top value according to the near plane change.
API
void eq::Channel::setNearFar( const float near, const float far );
Open Issues
Only the current context is modified, subsequent rendering tasks are not
affected. Future implementations will have to retain the near and far values
set for the following operations, e.g., from Channel::cull
to Channel::draw.
Potential rounding problems due to use of float values.
The application has to set the same near/far on all channels, otherwise z-based DB composition does not work.
