Initial TrueGrowth source import
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openspec/changes/add-image-3d-rotation-control/proposal.md
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openspec/changes/add-image-3d-rotation-control/proposal.md
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# Change: Add image 3D rotation control
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## Why
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画布当前只提供二维旋转控件,用户无法给图片做可控的透视倾斜效果。新增图片级 3D 旋转可以满足常见海报、拼贴和排版场景,同时不改变现有几何模型。
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## What Changes
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- 为普通画布图片增加可持久化的 `transform3d` 视觉变换字段。
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- 在单选普通图片时,在 popup-toolbar 上显示 3D 调节按钮。
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- 点击 3D 按钮打开调节面板,通过 `rotateX`、`rotateY` 和 `perspective` 控件实时预览,确认后作为一次可撤销历史提交,取消时回滚。
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- 选中带旋转/3D 变换的图片用于 AI 生成时,参考图保持原图,旋转参数作为文本上下文随提示词传递。
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- PPT 等导出路径继续按原始矩形图片降级,不在本次实现透视导出。
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## Impact
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- Affected specs: `canvas-image-transform`
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- Affected code: image rendering component, popup-toolbar image 3D panel, AI selection context extraction, targeted tests.
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