Make alpha-map differentiable#36
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The alpha map is now rendered as a 5th image channel using a constant-1 feature per Gaussian. Since Σᵢ 1·αᵢ·Tᵢ is exactly `1 − T_final`, channel 5 equals the alpha map that `ssi_depth_loss` previously read from `istate.accum_α` as a detached side channel.
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The alpha map is now rendered as a 5th image channel using a constant-1 feature per Gaussian. Since Σᵢ 1·αᵢ·Tᵢ is exactly
1 − T_final, channel 5 equals the alpha map thatssi_depth_losspreviously read fromistate.accum_αas a detached side channel.