3.2 KiB
.title Post processing
Post processing occures after main scene rendering in order to add more realistic effects (motion blur, ambient occlusion...)
.img("post_process_pipeline.png")
Post process
- [BloomPostProcess]
- [ChromaticDispersionPostProcess]
- [HSLPostProcess]
- [MotionBlurPostProcess]
- [RadialBlurPostProcess]
- [SAOPostProcess]
- [SharpenPostProcess]
Usage (python)
All post-processings have the same init/remove procedures:
import harfang as hg
...
camera = scene.GetCurrentCamera()
post_process = hg.BloomPostProcess()
camera.AddComponent(post_process)
...
camera.RemoveComponent(post_process)
...
In that exemple we use "BloomPostProcess", but it could be "ChromaticDispersionPostProcess", "HSLPostProcess", and so on...
Post process Stack
You can add as much PostProcessComponent as you like to the Camera.
It will be executed in the order of appearance in the Node's stack: this is the Post Process stack.
The order of execution of the post-processes is important:
.img("post_process_stack.png")
BloomPostProcess
Drops a glow around enlighten areas. This effect enhances the impression of brightness.
Bloom post-process:
.img("bloom_01.png")
No post-process:
.img("no_post_process.png")
ChromaticDispersionPostProcess
This filter works by independently offseting the red, green and blue components of the input image.
Chromatic dispersion post-process:
.img("chromatic_dispersion_01.png")
No post-process:
.img("no_post_process.png")
HSLPostProcess
Post-process component implementing a Hue/Saturation/Brightness filter.
- Hue: add a circular shift to pixel colors.
- Saturation: set the colors strength (0: picture in grayscale).
- Brightness: Set the brightnes level (0 sets the screen to black). This can be used to fade-in / fade-out effect.
HSL post-process:
.img("HSL_01.png")
No post-process:
.img("no_post_process_camaro.png")
MotioBlurPostProcess
This effect reproduce the famous cinematographic effect that blurs moving parts.
The faster the part, the blurrier it is. Motion-blur increases the realism of the rendering by softening the movements.
Motion blur post-process:
.img("motionblur_01.png")
No post-process:
.img("no_post_process_camaro.png")
RadialBlurPostProcess
This effect blurs the pixels from a point of the screen. The further the pixels are from the point, the blurrier they are.
Unlike motion-blur, the radial-blur is independent of motion.
Radial blur post-process:
.img("radial_blur_01.png")
No post-process:
.img("no_post_process_camaro.png")
SAOPostProcess
S.A.O for Screen-space Ambient Occlusion.
SAO is a fast real-time ambient occlusion rendering. It calculates pixels occlusions using the frame Z-Buffer.
It's an approximation of real ambient occlusion, but it's quite faster.
SAO is independant of scene complexity, as it works only on pixels datas (colors buffer & Z-Buffer).
SAO post-process:
.img("SAO_01.png")
No post-process:
.img("no_post_process_camaro.png")
SharpenPostProcess
This effect reinforce contrasted edges using a convolution matrice.
Sharpen post-process:
.img("Sharpen_01.png")
No post-process:
.img("no_post_process.png")