Creating Solid Lines in Three.js

If you want to create a solid line instead of a dashed line, you don't need to use LineDashedMaterial at all. Three.js provides a simpler material specifically for solid lines called LineBasicMaterial.

Using LineBasicMaterial

For solid lines, you should use LineBasicMaterial instead of trying to modify LineDashedMaterial:

JAVASCRIPTCopied
// Create a solid line with LineBasicMaterial
const material = new THREE.LineBasicMaterial({
    color: 0xffffff,
    linewidth: 1  // Note: linewidth may not work in WebGL as expected
});

This will give you a solid line without any dashes or gaps.

Alternative Approach

If you still want to use LineDashedMaterial but make it appear solid, you can set the gapSize to 0 or make the dashSize extremely large compared to the line length:

JAVASCRIPTCopied
// Using LineDashedMaterial but making it appear solid
const material = new THREE.LineDashedMaterial({
    color: 0xffffff,
    dashSize: 100000,  // Very large dash size
    gapSize: 0,        // No gaps
});

Remember that when using LineDashedMaterial, you need to call the computeLineDistances() method on your line geometry:

JAVASCRIPTCopied
const line = new THREE.Line(geometry, material);
line.computeLineDistances();

Complete Example

Here's a complete example using LineBasicMaterial for solid lines:

JAVASCRIPTCopied
// Create a geometry for your line
const points = [];
points.push(new THREE.Vector3(-10, 0, 0));
points.push(new THREE.Vector3(0, 10, 0));
points.push(new THREE.Vector3(10, 0, 0));

const geometry = new THREE.BufferGeometry().setFromPoints(points);

// Create a solid line material
const material = new THREE.LineBasicMaterial({
    color: 0xffffff
});

// Create the line
const line = new THREE.Line(geometry, material);

// Add to scene
scene.add(line);

This approach is simpler and more efficient for creating solid lines in Three.js.