Volume data non-photorealistic rendering method based on GPU (graphic processing unit) acceleration
A non-photorealistic rendering and volume data technology, applied in image data processing, 3D image processing, instruments, etc., can solve problems such as low efficiency and acceleration, and achieve good rendering effect, rendering effect and realistic effect.
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments of the present invention.
[0035] For a given volume data consisting of voxels ( figure 2 voxel grid), this method includes the following steps for the non-realistic rendering of the volume data:
[0036] Step (1) We set six viewpoints ( figure 2 In the eye point, the other five viewpoints are not shown) in the six positive and negative directions of the X, Y, and Z coordinate axes, the scene is drawn by ray casting (Ray Casting). This method is an algorithm based on the image space. From each pixel of the image, a ray is emitted along the direction of the line of sight. The ray passes through the entire scene. The value and opacity are accumulated until the light breaks out of the scene. The cumulative formula of color and opacity is as formula (1) (sampled and synthesized from the back to the front):
[0037] C ...
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