This application relates to an image rendering method performed by a computer device, and further relates to the field of gaming technologies. The method includes: flattening an original object mesh model to obtain a flat mesh model, the original object mesh model being an original three-dimensional mesh model of a target virtual object; generating a patch model according to a bounding box patch of the flat mesh model; performing topological reconstruction on the patch model, to obtain a reconstructed mesh model, a quantity of surfaces of the reconstructed mesh model being less than a quantity of surfaces of the original object mesh model; and reconstructing a three-dimensional mesh model based on the reconstructed mesh model.