Fix shading bugs on Linux systems

src/headless/cli.ts

@@ -81,7 +81,7 @@ export async function main(argv: string[]) {
     )
     .option('--chrome-args <arg...>', 'Additional Chrome launch argument(s).')
     .option(
-      '--max-old-space-size',
+      '--max-old-space-size  <number>',
       "Sets the max memory size of V8's old memory section in the browser (in MiB) (default: 16384).",
       '16384',
     )

src/headless/headlessBrowser.ts

@@ -40,7 +40,7 @@ export async function runShadingSceneHeadlessChrome(
         '--enable-webgl2',
         '--no-sandbox',
         '--disable-dev-shm-usage', // Overcome limited resource problems
-        `--max_old_space_size=${options.maxOldSpaceSize}`, // Increase V8 heap size
+        `--js-flags=--max_old_space_size=${options.maxOldSpaceSize}`, // Increase V8 heap size
         ...launchArgs,
       ],
       protocolTimeout: 24 * 60 * 60 * 1_000,

src/main.ts

@@ -232,6 +232,24 @@ export class ShadingScene {
     const minSunAngle = this.minSunAngle ?? getMinSunAngleFromIrradiance(this.solarIrradiance);
     this.shadingGeometry = filterShadingBufferGeometry(this.simulationGeometry, this.shadingGeometry, minSunAngle);
 
+    // Move geometry coordinates to the coordinate system origin
+    const simPoints = this.simulationGeometry.attributes.position.array;
+    const xShift = simPoints[0];
+    const yShift = simPoints[1];
+    const zShift = simPoints[2];
+
+    for (let i = 0; i < simPoints.length; i += 3) {
+      simPoints[i] -= xShift;
+      simPoints[i + 1] -= yShift;
+      simPoints[i + 2] -= zShift;
+    }
+    const shadingPoints = this.shadingGeometry.attributes.position.array;
+    for (let i = 0; i < shadingPoints.length; i += 3) {
+      shadingPoints[i] -= xShift;
+      shadingPoints[i + 1] -= yShift;
+      shadingPoints[i + 2] -= zShift;
+    }
+
     // Merge geometries
     this.simulationGeometry = this.refineMesh(this.simulationGeometry, 1.0);
 
@@ -279,6 +297,14 @@ export class ShadingScene {
       this.solarIrradiance[0].metadata.valid_timesteps_for_aggregation,
     );
 
+    // Restore original coordinates before creating the output mesh
+    const simResultPoints = this.simulationGeometry.attributes.position.array;
+    for (let i = 0; i < simResultPoints.length; i += 3) {
+      simResultPoints[i] += xShift;
+      simResultPoints[i + 1] += yShift;
+      simResultPoints[i + 2] += zShift;
+    }
+
     return this.createMesh(this.simulationGeometry, pvYield, maxYieldPerSquareMeter);
   }
 

src/rayTracingWebGL.ts

@@ -34,7 +34,8 @@ export async function rayTracingWebGL(
   const vertexShaderSource = `#version 300 es
         #define INFINITY         1000000.0
         precision highp float;
-
+        precision highp int;
+        precision highp sampler2D;
 
         uniform sampler2D u_triangles;
         uniform vec3 u_sun_direction;