The 3D effect of a projector can vary significantly based on several factors, including the technology used, the projector's native resolution, and the quality of the 3D glasses. Generally, the 3D effect of modern projectors is quite good, offering a immersive and engaging cinematic experience. However, the quality can range from impressive to merely adequate, depending on the specific model and its features.

Modern projectors often utilize either DLP (Digital Light Processing) or LCD (Liquid Crystal Display) technology for 3D projection. DLP projectors, for instance, are known for their bright and sharp images, which can enhance the 3D effect. LCD projectors, on the other hand, tend to offer a wider color gamut and better black levels, which can also contribute to a more convincing 3D experience. The native resolution of the projector also plays a crucial role; higher resolutions, such as 1080p or 4K, provide more detail and can make the 3D effect more realistic.

According to a study by DisplaySearch, a market research firm, the 3D projector market has seen significant growth in recent years, with a particular focus on home theater applications. The report states that "3D projectors have become increasingly popular due to their ability to provide a large, immersive screen experience in the home." Furthermore, the study highlights that "projectors with higher resolutions and advanced 3D technologies are driving the market forward.

The quality of the 3D glasses is another critical factor. Some projectors come with active shutter glasses, which sync with the projector's signal to create a seamless 3D effect. Other projectors use passive polarized glasses, which are generally more affordable but may not provide the same level of image quality. The comfort and weight of the glasses also play a role in the overall 3D experience.

In conclusion, the 3D effect of a projector can be quite good, especially with modern technologies and high-resolution models. However, the overall quality can vary widely, and consumers should consider factors such as technology, resolution, and glass quality when evaluating the 3D performance of a projector.