11 MRT Radiation

Create comfort sensor probes from meshes (one probe per face center, facing the face normal) and/or points (facing corresponding Normals), mixed freely on one input.

Solves MRT on a prepared VF Model: shortwave (direct raycast, or Radiance DDS when MRT Settings enables reflections) + view-factor longwave. Wire the VF Model straight from MRT View Factors for ambient/FFT surface temperatures, or through SurfaceTemp (EnergyPlus) for E+ temperatures. Result feeds Deconstruct MRT and UTCI.

Tags Breps or Meshes as a radiation surface for an MRT analysis. Breps are meshed at Patch Size; Meshes are used face-for-face as given.

Assembles tagged surfaces + sensors into a radiation model, builds the sky dome, and solves probe-to-polygon view factors. Feed the VF Model to SurfaceTemp (EnergyPlus) and/or MRT Solve. The sweep is the expensive part of an MRT run — solving it once here lets the downstream stages re-run without repeating it.

Thermal + optical material properties for a building/ground MRT surface.

Canopy material properties for an MRT tree surface.

Leaf/canopy material properties for an MRT vegetation surface.

Mean radiant temperature at each sensor, hour by hour. MRT = shortwave + longwave. SHORTWAVE — what the sensor absorbs from sun and sky. Either a direct raycast (default, pure C#) or the Radiance DDS chain (MRT Settings -> Radiance Reflections), which adds diffuse sky and interreflection off the surroundings. Radiance returns annual total and direct illuminance per sensor, which are mapped onto the probes' shortwave series. LONGWAVE — what the sensor exchanges with everything around it, weighted by view factors traced from each sensor against the scene and the sky dome. SURFACE TEMPERATURES come from ENERGYPLUS, not Radiance — Radiance is a light transport engine and computes no temperatures at all. With MRT Settings -> EnergyPlus Surfaces on, Eddy3D builds an epJSON from the polygons that actually matter to the sensors (those inside the cumulative view-factor percentile and above the small-face cutoff; everything else is demoted to a shading surface), runs EnergyPlus against the EPW, and maps the surface-specific temperatures out of the ESO back onto the geometry. With it off, every surrounding surface is simply assumed to sit at air temperature. SKY TEMPERATURE is always Clark-Allen from dew point, dry bulb, opaque cloud cover and relative humidity — it needs no engine.

Configuration for the MRT + UTCI analysis.

Direct sun hours and shadow by ray casting — an interactive preview, not a Radiance simulation.

Probe-specific statistics (and optionally the raw hours) from an MRT Result, without putting the full 8760-hour year on the canvas.

Colors the model's surfaces by view factor: the mean each face receives from all sensors, or one chosen sensor's view factors to every face. Values output is per face, in mesh face order, for custom gradients.

Equal-angle fisheye of the hemisphere above one sensor, as a colored mesh — a flat disk or a 3D dome (Display dropdown): sky, building, ground and vegetation per direction, plus the sensor's cosine-weighted sky view fraction.

Computes the Sky View Factor (SVF) for each input point using the Tregenza 145-patch sky subdivision. Casts 145 rays toward the upper hemisphere and returns the fraction of unobstructed sky directions (0 = fully obstructed, 1 = fully open sky).