Effects

Korender includes a set of predefined effect shaders, accessible through special material modifiers. Each effect may expose adjustable parameters, which can be configured using effect-specific uniforms.

Fire

Fire effect implements animated flames. Normally, it's used on a Billboard with transparency enabled:

Billboard(
    material = billboard {
        scale = Vec2(2f, 10f)
        effect = fire(strength = 4f)
    },
    transparent = true
)

Fire effect parameters:

Parameter	Type	Default	Description
strength	Float	3.0f	Controls how rippled the flame appears, 1-5

Fireball

Fireball is a spherical fire-like effect that can be used for rendering explosions. Normally, it's used on a Billboard with transparency enabled:

Billboard(
    material = billboard {
        scale = Vec2(radius * phase, radius * phase)
        effect = fireball(power = phase)
    },
    transparent = true
)

Fireball effect parameters:

Parameter	Type	Default	Description
power	Float	0.5f	Controls the fireball expansion: 0.0 for explosion initiation, 1.0 for fully exploded. Animate 0.0 to 1.0 for explosion effect

Smoke

Single spherical smoke particle effect. Normally, it's used on a batched Billboard with transparency enabled:

Billboard(
    material = billboard {
        scale = Vec2(1f, 1f)
        effect = smoke(density = 0.5f, seed = 0.1f)
    },
    transparent = true
)

Smoke effect parameters:

Parameter	Type	Default	Description
density	Float	0.5f	Smoke density, 0-1
seed	Float	0.0f	Randomness seed — provide unique values for uniquely looking smoke particles 0-1

Water

Wavy water surface with sky reflections. Water is implemented as a post-process filter:

Frame {
    // Render the scene
    PostProcess(water(waveScale = 25.0f, sky = fastCloudSky()))
}

Water parameters:

Parameter	Type	Default	Description
waterColor	ColorRGB	ColorRGB(0x00182A)	Water base color
transparency	Float	0.1f	Water transparency ratio
waveScale	Float	25.0f	Waves horizontal scale
waveMagnitude	Float	0.3f	Waves vertical magnitude
sky	SkyMaterial	(required)	Sky material for reflections