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FFTBloomHeader

iMMERSE Ultimate: Convolution Bloom is a high-end bloom effect based on Fast-Fourier Transform (FFT) technology that produces unique diffraction spikes in real-time.

Core Parameters:​

Bloom Padding​

Controls padding to prevent edge artifacts caused by FFT wrap-around effects. Higher values eliminate artifacts but reduce effective resolution.

Log Exposure Bias​

Adjusts logarithmic exposure before bloom processing. Range: -5.0 to 5.0. Negative values reduce exposure, positive values increase it.

Log HDR Whitepoint​

Sets brightness threshold for bloom generation. Range: 0.0 to 12.0. Lower values create bloom in darker areas, higher values shift bloom toward bright areas.

Bloom Intensity​

Controls overall bloom strength. Range: 0.0 to 1.0. Higher values create more pronounced bloom effects.

Bloom Radius​

Determines how far bloom spreads from bright sources. Larger radius creates diffuse bloom, smaller radius produces focused bloom with sharper spikes.

Bloom Haziness​

Controls color saturation in bloom. 1.000 preserves colors, 0.000 creates white bloom, intermediate values balance both.

Diffraction Spikes:​

Diffraction Spike Amount​

Number of spikes around bright areas. Range: 1 to 7. Higher values create more dramatic starburst effects.

Diffraction Spike Rotation​

Controls spike orientation. Range: 0.0 to 1.0 (full 360-degree rotation).

Diffraction Spike Radius​

How far spikes extend from bright areas. Higher values create longer, more dramatic spikes.

Diffraction Spike Blurriness​

Controls spike sharpness. Lower values create crisp spikes, higher values create soft, blurred spikes.

Diffraction Spike Phase Amount​

Controls spike brightness. Higher values make spikes more visible and prominent.

Preprocessor Definitions:​

CONVOLUTION_BLOOM_MASK_PRESET​

  • 0: Diffraction Spikes - Creates starburst effects with full spike control
  • 1: Inverse Square Glow - Traditional bloom similar to Solaris

CONVOLUTION_BLOOM_QUALITY​

  • 0: Low - Reduced quality, better performance
  • 1: Medium - Balanced quality and performance
  • 2: High - Maximum quality, performance cost

Debug Views:​

  • None: Standard bloom output
  • Bloom Only: Shows only bloom effect for parameter adjustment
  • Mask Texture: Displays Fourier transform mask