CurvedMesh.qml - mozsearch

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// Copyright (C) 2025 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

import QtQuick

import QtQuick3D

import QtQuick3D.Helpers

ProceduralMesh {

        property real partitions: 50

        property real segments: 1

        property real radius: 50.0

        property real height: 50.0

        property real width: 80

        property var meshArrays: generateMesh(partitions , width, height, radius)

        positions: meshArrays.verts

        normals: meshArrays.normals

        uv0s: meshArrays.uvs

        indexes: meshArrays.indices

        function generateMesh(partitions : real, width: real, height: real, radius: real) : var {

            let verts = []

            let normals = []

            let uvs = []

            let indices = []

            // width = angleSpan * radius

            const angleSpan = width / radius

            for (let i = 0; i <= partitions ; ++i) {

                for (let j = 0; j <= 1; ++j) {

                    const u = i / partitions ;

                    const v = j;

                    const x = u - 0.5 // centered

                    const angle = x * angleSpan

                    const posZ = radius - radius * Math.cos(angle)

                    const posY = height * v

                    const posX = radius * Math.sin(angle)

                    verts.push(Qt.vector3d(posX, posY, posZ));

                    let normal = Qt.vector3d(0 - posX, 0, radius - posZ).normalized();

                    normals.push(normal);

                    uvs.push(Qt.vector2d(u, v));

            for (let i = 0; i < partitions ; ++i) {

                let a = (segments + 1) * i;

                let b = (segments + 1) * (i + 1);

                let c = (segments + 1) * (i + 1) + 1;

                let d = (segments + 1) * i + 1;

                // Generate two triangles for each quad in the mesh

                // Adjust order to be counter-clockwise

                indices.push(a, b, d);

                indices.push(b, c, d);

            return { verts: verts, normals: normals, uvs: uvs, indices: indices }