Fix textToModel face normals for extruded text

[VANSH3104]

Resolves #8074

Changes:

Screenshots of the change:

Screencast.From.2025-09-15.15-30-14.mp4

PR Checklist

• [ x] npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

[VANSH3104]

@davepagurek Could you please take a look at this PR and provide a review? Thanks!

[davepagurek]

Hi! So far this change just reverses the order of the vertices in front faces; I don't think we need to change that. I left a comment here #8074 (comment) explaining the approach I had in mind, which likely involves changing this part of the code that constructs the geometry:

p5.js/src/type/p5.Font.js

Lines 547 to 588 in fc8ca8a

	if (extrude === 0) {
	const prevValidateFaces = this._pInst._renderer._validateFaces;
	this._pInst._renderer._validateFaces = true;
	this._pInst.beginShape();
	this._pInst.normal(0, 0, 1);
	for (const contour of contours) {
	this._pInst.beginContour();
	for (const { x, y } of contour) {
	this._pInst.vertex(x, y);
	}
	this._pInst.endContour(this._pInst.CLOSE);
	}
	this._pInst.endShape();
	this._pInst._renderer._validateFaces = prevValidateFaces;
	} else {
	const prevValidateFaces = this._pInst._renderer._validateFaces;
	this._pInst._renderer._validateFaces = true;
	// Draw front faces
	for (const side of [1, -1]) {
	this._pInst.beginShape();
	for (const contour of contours) {
	this._pInst.beginContour();
	for (const { x, y } of contour) {
	this._pInst.vertex(x, y, side * extrude * 0.5);
	}
	this._pInst.endContour(this._pInst.CLOSE);
	}
	this._pInst.endShape();
	}
	this._pInst._renderer._validateFaces = prevValidateFaces;
	// Draw sides
	for (const contour of contours) {
	this._pInst.beginShape(this._pInst.QUAD_STRIP);
	for (const v of contour) {
	for (const side of [-1, 1]) {
	this._pInst.vertex(v.x, v.y, side * extrude * 0.5);
	}
	}
	this._pInst.endShape();
	}

Currently there's an if/else that uses a different approach if extruding vs if creating a flat model. Instead, we'd probably always start with the flat model, but if we need extrusion, you could read the vertices/faces/edges properties of the geometry to manually construct a second extruded geometry.