axial_blend()

UVField MayaFlux::Kinesis::axial_blend ( const glm::vec3 &  origin = glm::vec3(0.0F), float  scale = 1.0F, float  blend = 4.0F  )

inline

axial_blend projection: blend of three axis-aligned planar projections

Parameters

origin	World-space tile origin
scale	UV scale applied uniformly to all three planes
blend	Sharpness of the blend between planes (higher = sharper)

Returns

UVField: glm::vec3 -> glm::vec2

Projects onto XZ, XY, and YZ planes and blends by weights derived from the absolute value of the offset position, raised to blend and normalised. Uses position as a proxy for surface normal, which works well for geometry radiating from the origin. Geometry that is flat or axially aligned may show visible blending artefacts.

The blended UV is a weighted average: XZ plane contributes (x, z) weighted by the Y component. XY plane contributes (x, y) weighted by the Z component. YZ plane contributes (y, z) weighted by the X component.

Definition at line 129 of file UVProjection.hpp.

{
    return { .fn = [origin, scale, blend](const glm::vec3& p) -> glm::vec2 {
        const glm::vec3 d = (p - origin) * scale;
 
        glm::vec3 w = glm::pow(glm::abs(d), glm::vec3(blend));
        const float wsum = w.x + w.y + w.z;
        if (wsum < 1e-6F)
            return glm::vec2(0.0F);
        w /= wsum;
 
        const glm::vec2 uv_xz(d.x, d.z);
        const glm::vec2 uv_xy(d.x, d.y);
        const glm::vec2 uv_yz(d.y, d.z);
 
        return uv_xz * w.y + uv_xy * w.z + uv_yz * w.x;
    } };
}

References MayaFlux::Kinesis::Tendency< D, R >::fn, and scale().

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