mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:44:23 +08:00
69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package threed
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import (
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"errors"
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)
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// 视图相机路径解析错误，由文档适配层转换为相应格式的错误
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var (
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ErrCameraNotFound = errors.New("missing U3D camera path")
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ErrAmbiguousCamera = errors.New("ambiguous U3D camera instance")
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)
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// ViewCamera 返回视图节点指定父路径的世界变换，不修改绘制会话
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// 入参: selected 视图节点索引, path 从根至节点的路径, exactRoot 是否要求路径始于根
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// 返回: [16]float64 世界变换, error 缺失、歧义或取消错误
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func (r *Renderer) ViewCamera(selected int, path []string, exactRoot bool) ([16]float64, error) {
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var transform [16]float64
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if selected < 0 || selected >= len(r.model.Nodes) || r.model.Nodes[selected].Kind != "View" {
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return transform, ErrCameraNotFound
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}
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found := false
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for _, index := range r.byNode[selected] {
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if err := r.ctx.Err(); err != nil {
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return transform, err
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}
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current, match := index, true
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for j := len(path) - 1; j >= 0; j-- {
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if j%256 == 0 {
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if err := r.ctx.Err(); err != nil {
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return transform, err
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}
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}
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if current < 0 || r.model.Nodes[r.scene[current].node].Name != path[j] || r.model.Nodes[r.scene[current].node].Kind != "View" {
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match = false
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break
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}
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current = r.scene[current].parent
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}
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if exactRoot && current >= 0 {
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match = false
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}
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if !match {
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continue
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}
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if found {
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return transform, ErrAmbiguousCamera
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}
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transform, found = r.scene[index].world, true
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}
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if !found {
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return transform, ErrCameraNotFound
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}
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return transform, nil
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}
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