Image processing method, image processing program, and image processing apparatus
In an image processing method to form a predetermined image with an image processing unit having a frame-buffer and z-buffer corresponded to the frame-buffer, a main-model and a sub-model containing at least one part of the main model are arranged at a predetermined position in a virtual 3-dimensional space. The sub-model is rendered in the frame-buffer in a write-protected state to the z-buffer, after that, the main-model is rendered in the frame-buffer in a released write-protected state to the z-buffer and updating a memory content of the z-buffer according to depth information that the main model has.
1. An image processing method for forming a predetermined image with an image processing unit having a frame-buffer and a z-buffer corresponded to the frame-buffer, wherein the method comprises the steps of:
arranging a main-model and a sub-model containing at least one part of the main-model at a predetermined position in a virtual three dimensional space;
rendering the sub-model into the frame-buffer under a state wherein the z-buffer is entirely write-protected; and
rendering the main-model into the frame-buffer under a state wherein the write-protect of the z-buffer is released and updating a memory content of the z-buffer according to depth information of the main-model.
2. The image processing method according to claim 1 , wherein the method comprises the step of:
rendering a background, to be arranged behind the main-model and the sub-model in the virtual three dimensional space in view of a predetermined view point, into the frame-buffer, and
updating the memory content of the z-buffer according to depth information of the background prior to the rendering of the sub-model.
3. The image processing method according to claim 1 , wherein the sub-model is constituted by a size which can give an outline having predetermined width to a periphery of the main-model.
4. The image processing method according to claim 1 , wherein the sub-model is an un-similar figure of the main-model.
5. The image processing method according to claim 1 , wherein at least one part of the main-model extends off the sub-model.
6. An image processing program for forming a predetermined image with a computer having a frame-buffer and a z-buffer corresponded to the
frame-buffer, wherein the program is executable and constructed to make the computer execute the procedures of:
arranging a main-model and a sub-model containing at least one part of the main-model at a predetermined position in a virtual 3-dimensional space;
rendering the sub-model into the frame-buffer under a state wherein the z-buffer is entirely write-protected; and
rendering the main-model into the frame-buffer under a state wherein the write-protect of the z-buffer is released and updating a memory content of the z-buffer according to depth information of the main-model.
7. The image processing program according to claim 6 , wherein the program is constructed to make a computer execute the procedures of:
rendering a background, to be arranged behind the main-model and the sub-model in the virtual three dimensional space in view of a predetermined view point, into the frame-buffer; and
updating the memory content of the z-buffer according to depth information of the background prior to the rendering of the sub-model.
8. The image processing program according to claim 6 , wherein the sub-model is constituted by a size which can give an outline having a predetermined width to a periphery of the main-model.
9. The image processing program according to claim 6 , wherein the sub-model is an un-similar figure of the main-model.
10. The image processing method according to claim 6 , wherein at least one part of the main-model extends off the sub-model.
11. An image processing apparatus for forming a predetermined image, comprising:
a video memory having a frame-buffer and a z-buffer corresponded to the frame-buffer,
a device for arranging a main-model and a sub-model containing at least one part of the main-model at a predetermined position in a virtual three dimensional space;
a device for rendering the sub-model into the frame-buffer under a state wherein the z-buffer is entirely write-protected; and
a device for rendering the main-model into the frame-buffer under a state wherein the write-protect of the z-buffer is released and updating a memory content of the z-buffer according to depth information of the main-model.
12. The image processing apparatus according to claim 11 , wherein the apparatus comprises:
a device for rendering a background, to be arranged behind the main-model and the sub-model in the virtual three dimensional space in view of a predetermined view point, into the frame-buffer; and
a device for updating the memory content of the z-buffer according to depth information of the background prior to the rendering of the sub-model.
13. The image processing apparatus according to claim 11 , wherein the sub-model is constituted by a size which can give an outline having predetermined width to a periphery of the main-model.
14. The image processing apparatus according to claim 11 , wherein the sub-model is an un-similar figure of the main-model.
15. The image processing apparatus according to claim 11 , wherein at least one part of the main-model extends off the sub-model.