mirv_sample_exposure

Syntax

• Default: 1.0
• Type: floating point, 0.0 - 1.0 (recommended range)

== Description ==

Controls the frame exposure time. That is the fraction of time a frame is exposed to incoming samples (from the beginning of the frame). A higher value mean longer exposure than a lower value. If you want cross-frame motion-blur see [[__mirv_sample_frame_strength|GoldSrc:__mirv_sample_frame_strength]] instead.

This is similar to a Rotary disc shutter where Of course HLAE does not simulate a rotating disc, instead the whole frame is closed or opened ideally at once (electronic shutter).

A lower exposure time results in less samples being used, so you might want to compensate with a higher [[mirv_sample_sps|GoldSrc:mirv_sample_sps]] value:

HLAE tries to optimize the processing of the samples and speeds things a bit up when it determines samples can be skipped due to the shutter being closed (the actual amount depends on the sampling method set).

Consequently if you use a lower exposure value you can set [[mirv_sample_sps|GoldSrc:mirv_sample_sps]] higher in order to get about the same amount of samples during the shorter exposure time. (As a rule of thumb use )

Examples

The examples below are available as test video: http://youtu.be/0Bm9kv-3t-Q

360° shutter angle, 10 samples per exposure, 30 fps output

mirv_movie_fps 30
mirv_sample_enable 1
mirv_sample_exposure 1.0
mirv_sample_sps 300

90° shutter angle, 10 samples per exposure, 30 fps output

mirv_movie_fps 30
mirv_sample_enable 1
mirv_sample_exposure 0.25
mirv_sample_sps 1200

10° shutter angle, 10 samples per exposure, 30 fps output

mirv_movie_fps 30
mirv_sample_enable 1
mirv_sample_exposure 0.028
mirv_sample_sps 10800

Speed considerations

Lower values are faster.

See also

• [[GoldSrc:Sampling System]]
• [[__mirv_sample_frame_strength|GoldSrc:__mirv_sample_frame_strength]]
• [[GoldSrc:Commands]]