View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0024287 | Open CASCADE | OCCT:Visualization | public | 2013-10-24 12:05 | 2014-11-11 12:52 |
| Reporter | Assigned To | ||||
| Priority | normal | Severity | minor | ||
| Status | closed | Resolution | fixed | ||
| Platform | A | OS | L | ||
| Product Version | 6.7.0 | ||||
| Target Version | 6.8.0 | Fixed in Version | 6.8.0 | ||
| Summary | 0024287: Improving camera behavior | ||||
| Description | While porting TKV3d to camera model some trade-offs were made to achieve backward compatibility. Mainly it affects camera coordinate system in orthographic mode. For example znear and zfar values are counted from center camera point (instead of eye point normally). Also zfit from old code was not ported properly for perspective mode. Internal camera z-fitting system was implemented instead. It would be better for camera API usability to achieve consistent approach for both perspective and orthographic camera modes. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
| duplicate of | 0024413 | closed | Open CASCADE | Visualization - get rid of projection shift from orthographic camera definition |
|
|
There are several points that should be taken into account when revising Z-Near, Z-Far management. Z-Near and Z-Far are the public parameters of the camera, which should not be changed by the camera internally, if the user is not expecting any modifications. This would make the user interface clear, and will unify approach of setting all of the camera public parameters. Z-size is the property of view which was created for convenience of use. However, currently this term is not very clear and its definition, probably, would be changed. In current terms, the Z-size has different effect on Z-Near, Z-Far and Distance parameters of camera for the following reasons: - For orthographic view, the camera projection should not clip the viewed model (if clipping is not forced). The camera should not "go inside" of the displayed model. - For perspective view, the camera could "go inside" of the displayed model during zooming, due to the fact that zooming within the view should be done with keeping camera FOVy angle of perspective. For references: there are two natural ways to zoom the camera - by changing FOVy or by changing Distance of camera. Due to these aspects of use, the Distance of camera can be modified by view in orthographic mode to avoid clipping of model by view orientation / view projection mapping. For perspective view, the Distance is a component part of zooming, and it should not be changed during z-fit operation. One point should be also noted: the Distance of camera in orthographic mode has passive role (as the view should not clip the model), however the result of sphere environment mapping depends on the z coordinate of the rendered vertex in camera view space. The higher the Distance of camera (correspondingly higher the z coordinate of rendered vertices in camera view space) - the better the effect of sphere environment mapping. Thus, it might be useful to have, in viewer, "OrthoDepth" parameter for orthographic mode to enlarge the Distance and improve the effect of sphere environment mapping. For perspective mode, there is no sense to introduce the parameter. |
|
|
Dear bugmaster, Goals of this issue already acheived in 0024413: Visualization - get rid of projection shift from orthographic camera definition. Please close the issue. |
|
|
Fix for this issue was integrated with fix for issue 0024413 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-10-24 12:05 |
|
New Issue | |
| 2013-10-24 12:05 |
|
Assigned To | => duv |
| 2014-02-10 11:49 |
|
Relationship added | related to 0024413 |
| 2014-02-12 12:44 |
|
Note Added: 0027855 | |
| 2014-04-04 18:16 |
|
Target Version | 6.7.1 => 6.8.0 |
| 2014-04-17 15:39 |
|
Assigned To | duv => bugmaster |
| 2014-04-17 15:39 |
|
Status | new => feedback |
| 2014-04-17 17:24 |
|
Note Added: 0028945 | |
| 2014-04-17 17:24 |
|
Status | feedback => reviewed |
| 2014-04-17 17:48 |
|
Status | reviewed => feedback |
| 2014-04-18 10:11 | bugmaster | Status | feedback => tested |
| 2014-04-18 10:12 | bugmaster | Note Added: 0028954 | |
| 2014-04-18 10:12 | bugmaster | Status | tested => verified |
| 2014-04-18 10:12 | bugmaster | Resolution | open => fixed |
| 2014-04-18 10:12 | bugmaster | Assigned To | bugmaster => duv |
| 2014-04-18 14:45 | kgv | Relationship replaced | duplicate of 0024413 |
| 2014-11-11 12:47 |
|
Fixed in Version | => 6.8.0 |
| 2014-11-11 12:52 |
|
Status | verified => closed |
