Unigine::Camera Class
| Header: | #include <UnigineCamera.h> |
The Camera class is used to create a new camera, set it up (set all the required matrices, field of view, masks and so on) and then pass it to an instance of the Viewport class to render an image from this camera.
Notice
An instance of this class is not a node.
A camera instance can have the following masks:
- Sound Source mask
- Sound Reverberation mask
- Viewport mask
- Reflection Viewport mask
Camera settings can be set up in the Camera Settings in UnigineEditor.
Usage Example#
In this example we create a Camera instance and PlayerSpectator player, specify camera parameters, set camera to the PlayerSpectator and set it as current game player.
In the AppWorldLogic.h header file include the UniginePlayers.h header and declare a PlayerSpectator and Camera smart pointers.
Source code (C++)
#include <UnigineLogic.h>
#include <UnigineStreams.h>
#include <UniginePlayers.h>
class AppWorldLogic : public Unigine::WorldLogic {
public:
/* public methods */
private:
Unigine::PlayerSpectatorPtr playerSpectator;
Unigine::CameraPtr camera;
};In the AppWorldLogic.cpp implementation file do the following:
- Include the UnigineGame.h header to set a new player by using setPlayer() method.
- Use using namespace Unigine directive: names of the Unigine namespace will be injected into global namespace.
- Specify the necessary parameters of the created Camera instance and set it to PlayerSpectator.
- Set PlayerSpectator as a current game player.
- Clear the pointer to the PlayerSpectator to avoid memory leaks.
Here are the necessary parts of code:
Source code (C++)
#include "AppWorldLogic.h"
#include "UnigineGame.h"
// inject Unigine namespace names to global namespace
using namespace Unigine;
/* ... */
int AppWorldLogic::init() {
// create a new PlayerSpectator and camera instance
playerSpectator = PlayerSpectator::create();
camera = Camera::create();
// specify the necessary camera parameters: FOV, ZNear, ZFar.
// add the post_sensor_red post-effect to camera
camera->setFov(110.0f);
camera->setZNear(0.1f);
camera->setZFar(10000.0f);
// set camera to the player
playerSpectator->setCamera(camera);
// specify the position and view direction of playerSpectator
playerSpectator->setViewDirection(Math::vec3(0.0f, 1.0f, 0.0f));
playerSpectator->setWorldPosition(Math::dvec3(-1.6f, -1.7f, 1.7f));
// set the Player to the Game singleton instance
Game::setPlayer(playerSpectator);
return 1;
}
/* ... */
int AppWorldLogic::shutdown() {
// clear the pointer to Player
playerSpectator.clear();
return 1;
}Camera Class
Enums
PROJECTION_MODE#
| Name | Description |
|---|---|
| PROJECTION_MODE_PERSPECTIVE = 0 | Perspective projection. |
| PROJECTION_MODE_ORTHOGRAPHIC = 1 | Orthographic projection. |
FOV_FIXED#
| Name | Description |
|---|---|
| FOV_FIXED_VERTICAL = 0 | Vertical FOV component is fixed. |
| FOV_FIXED_HORIZONTAL = 1 | Horizontal FOV component is fixed. |
FOV_MODE#
| Name | Description |
|---|---|
| FOV_MODE_VERTICAL = 0 | Vertical FOV mode. Vertical FOV of the camera is determined by the FOV value. |
| FOV_MODE_PHYSICALLY_BASED_CAMERA = 1 |
Physically based mode. Horizontal FOV of the physically-based camera is calculated using the focal length and film gate values according to the following formula: FOV_h = 2 * atan(film_gate / (2 * focal_length)) * Consts::RAD2DEG |
Members
static CameraPtr create ( ) #
Constructor. Creates a new camera with default settings:- Modelview, inverse modelview and offset matrices are 4×4 identity matrices.
- FOV is 60 degrees.
- Distance to the near clipping plane is 0.1 unit.
- Distance to the far clipping plane is 10000 units.
- Up direction vector is (0,0,1).
- Viewport, reflection, source and reverb masks are set to 00000001.
void getDirectionFromScreen ( Math::Vec3 & p0, Math::Vec3 & p1, float screen_x, float screen_y, float aspect ) const#
Casts the ray from a certain position on the screen.Arguments
- Math::Vec3 & p0 - Start coordinate of the ray.
- Math::Vec3 & p1 - End coordinate of the ray.
- float screen_x - X-coordinate of screen, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float screen_y - Y-coordinate of screen, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float aspect - Screen's aspect ratio (height to width).
Math::vec3 getDirectionFromScreen ( float screen_x, float screen_y, float aspect ) const#
Casts the ray from a certain position on the screen.Arguments
- float screen_x - X-coordinate of screen, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float screen_y - Y-coordinate of screen, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float aspect - Screen's aspect ratio (height to width).
Return value
Point coordinate.void setFov ( float fov ) #
Sets a vertical field of view of the camera and updates the projection matrix.
Notice
Horizontal FOV cannot be used since it varies depending on the viewport's aspect ratio. Setting FOV recalculates projection matrix with aspect ratio = 1.
You can use the following formula to calculate horizontal FOV from the vertical one for the given aspect ratio (width/height): FOV_h = 2 × atan ( (width / height) × tan(FOV_v / 2)).
Arguments
- float fov - New vertical field of view in degrees. The provided value will be saturated in the range [0;180].
float getFov ( ) const#
Returns the current vertical field of view of the camera.
Notice
Horizontal FOV cannot be used since it varies depending on the viewport's aspect ratio.
You can use the following formula to calculate horizontal FOV from the vertical one for the given aspect ratio (width/height): FOV_h = 2 × atan ( (width / height) × tan(FOV_v / 2)).
Return value
Vertical field of view in degrees.Math::Mat4 getIModelview ( ) const#
Returns the inverted view matrix of the camera.Return value
Inverse view matrix.void setModelview ( const Math::Mat4 & modelview ) #
Updates a modelview and inverse modelview matrices for the camera.Arguments
- const Math::Mat4 & modelview - New view matrix.
Math::Mat4 getModelview ( ) const#
Returns the current view matrix of the camera.Return value
Current view matrix.void setObliqueFrustum ( bool frustum ) #
Enables or disables obliqueness of the viewing frustum.Notice
It is recommended to set oblique viewing frustum using this method, as it doesn't affect the projection matrix. To specify the near clipping plane use the setObliqueFrustumPlane() method.
Arguments
- bool frustum - true to enable oblique viewing frustum; false to disable it.
bool isObliqueFrustum ( ) const#
Returns a value indicating if the viewing frustum is oblique.Return value
true if the viewing frustum is oblique; otherwise, false.void setObliqueFrustumPlane ( const Math::Vec4 & plane ) #
Sets the oblique near clipping plane of the viewing frustum.Notice
This method does not affect the projection matrix. To enable the oblique frustum use the setObliqueFrustum() method.
Source code (C++)
// AppWorldLogic.cpp
#include <UnigineGame.h>
using namespace Unigine;
/* .. */
int AppWorldLogic::update() {
// Write here code to be called before updating each render frame: specify all graphics-related functions you want to be called every frame while your application executes.
float time = Game::getTime();
// initializing a plane to be set as a near clipping plane
Math::Vec4 plane = Math::Vec4(1.0f, 1.0f, 1.0f, 1.0f + Math::sin(time) * 4.0f);
// getting a camera
CameraPtr camera = Game::getPlayer()->getCamera();
if (camera)
{
// enabling oblique frustum
camera->setObliqueFrustum(1);
// setting our plane as an oblique near clipping plane
camera->setObliqueFrustumPlane(plane);
}
return 1;
}
/* .. */Arguments
- const Math::Vec4 & plane - World coordinates of the oblique near clipping plane to set (Nx, Ny, Nz, D), where Nx, Ny, Nz - coordinates of the plane normal, D - distance from the origin to the plane.
Math::Vec4 getObliqueFrustumPlane ( ) const#
Returns the oblique near clipping plane of the viewing frustum.Return value
World coordinates of the oblique near clipping plane to set (Nx, Ny, Nz, D), where Nx, Ny, Nz - coordinates of the plane normal, D - distance from the origin to the plane.void setOffset ( const Math::mat4 & offset ) #
Sets an additional transformation (an offset matrix) for the camera. This transformation is applied after the modelview transformation. The offset matrix does not affect the view matrix or the position of the camera. For example, the offset matrix can be used to simulate camera shaking from an explosion.Arguments
- const Math::mat4 & offset - Offset matrix.
Math::mat4 getOffset ( ) const#
Returns an additional transformation (an offset matrix) set for the camera. This transformation is applied after modelview transformation. The offset matrix does not affect the view matrix or the position of the camera. For example, it can be used to simulate camera shake from an explosion.Return value
Offset matrix.void setPosition ( const Math::Vec3 & position ) #
Sets a new position of the camera and updates the modelview and inverse modelview (its 3rd column) matrices.Arguments
- const Math::Vec3 & position - Camera position in the world space.
Math::Vec3 getPosition ( ) const#
Returns the current position of the camera. The position vector is stored in the 3rd column of the inverse view matrix.Return value
Camera position in the world space.void setProjection ( const Math::mat4 & projection ) #
Updates the current projection matrix.Notice
It is not recommended to use this method for setting obliqueness of the near clipping plane of the frustum, as in this case a number of features (such as clouds, shadows, TAA, a number of engine optimizations, etc.) will not function properly. Please, use the setObliqueFrustum() method instead.
This method allows you to set your camera to use perspective or orthographic projection, depending on your project's requirements.
For example, you can use the following code to set up orthographic projection or perspective projection for your camera depending on a flag value:
Source code (C++)
// AppWorldLogic.cpp
/* ... */
#include <UnigineCamera.h>
#include <UnigineGame.h>
// inject Unigine namespace names to global namespace
using namespace Unigine;
/* ... */
// ortho flag - change this value to switch projection type
int ortho = 0;
int AppWorldLogic::init() {
// getting the camera of the current player
CameraPtr camera = Game::getPlayer()->getCamera();
// setting up near and far clipping planes and aspect ratio
float znear = 0.001f;
float zfar = 10000.0f;
float aspect = 16.0f / 9.0f;
if (ortho)
{
// setting up orthographic projection
camera->setProjection(Math::ortho(-1.0f, 1.0f, -1.0f, 1.0f, znear, zfar));
}
else
{
// setting up perspective projection
camera->setProjection(Math::perspective(60.0f, aspect, znear, zfar));
}
// setting player's camera
Game::getPlayer()->setCamera(camera);
return 1;
}
/* ... */Arguments
- const Math::mat4 & projection - Projection matrix.
Math::mat4 getProjection ( ) const#
Returns the current projection matrix with unit (1.0) aspect ratio.Return value
Projection matrix.Math::mat4 getProjectionFromScreen ( float screen_x0, float screen_y0, float screen_x1, float screen_y1, float aspect ) const#
Creates a projection matrix out of 2 screen positions. This is required for the frame selection.Arguments
- float screen_x0 - X-coordinate of the first screen position, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float screen_y0 - Y-coordinate of the first screen position, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float screen_x1 - X-coordinate of the second screen position, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float screen_y1 - Y-coordinate of the second screen position, in the [0;1] range, where 0 is the left upper point, 1 is the right lower point.
- float aspect - Screen's aspect ratio (height to width).
Return value
Projection matrix.void setReflectionViewportMask ( int mask ) #
Sets a bit mask for rendering reflections into the viewport. Reflections are rendered in the viewport if masks of reflective materials match this one (one bit at least).Arguments
- int mask - Integer, each bit of which is used to set a mask.
int getReflectionViewportMask ( ) const#
Returns the current bit mask for rendering reflections into the camera viewport. Reflections are rendered in the camera viewport if masks of reflective materials match this one (one bit at least).Return value
Integer, each bit of which is used to set a mask.void setReverbMask ( int mask ) #
Updates a bit mask that determines what reverberation zones can be heard. For sound to reverberate, at least one bit of this mask should match a reverb mask of the sound source and a reverb mask of the reverberation zone. Masks of a sound source and reverberation zone can match the camera's one in several bits, not necessarily one.Arguments
- int mask - Integer, each bit of which is a mask for reverberating sound sources and reverberation zones.
int getReverbMask ( ) const#
Returns the current bit mask that determines what reverberation zones can be heard. For sound to reverberate, at least one bit of this mask should match a reverb mask of the sound source and a reverb mask of the reverberation zone. Masks of a sound source and reverberation zone can match with the camera's one in several bits, not necessarily one.Return value
Integer, each bit of which is used to set a mask for reverberating sound sources and reverberation zones.int getScreenPosition ( float & screen_x, float & screen_y, const Math::Vec3 & point, float aspect ) const#
Projects the point in world coordinates to the screen. Screen coordinates are written into the first 2 variables passed to the method.Arguments
- float & screen_x - X-coordinate of the screen position.
- float & screen_y - Y-coordinate of the screen position.
- const Math::Vec3 & point - Point coordinates.
- float aspect - Aspect ratio (screen height to width).
Return value
1 if the point has been projected successfully; otherwise, 0.void setSourceMask ( int mask ) #
Updates a bit mask that determines what sound sources can be heard. For a sound source to be heard, its mask should match this one in at least one bit. Plus, the volume of sound channel in which the sound plays (its number also depends on this mask) should not be equal to 0.Arguments
- int mask - Integer, each bit of which specifies a sound channel.
int getSourceMask ( ) const#
Returns a bit mask that determines what sound channels can be heard. For a sound source to be heard, its mask should match this one in at least one bit. Plus, the volume of sound channel in which the sound plays (its number also depends on this mask) should not be equal to 0.Return value
Integer, each bit of which specifies a sound channel.void setUp ( const Math::vec3 & up ) #
Sets an up direction of the camera's viewport (i.e. tilt of the camera's viewport).Arguments
- const Math::vec3 & up - New upward direction vector. The vector is normalized to 1.
Math::vec3 getUp ( ) const#
Returns the current up direction of the camera's viewport (i.e. tilt of the camera's viewport).Return value
Upward direction vector.void setViewportMask ( int mask ) #
Sets a bit mask for rendering into the viewport. Object surfaces, materials, decals, lights and GUI objects will be rendered into the viewport only if their viewport masks match the camera's one (one matching bit is enough).Arguments
- int mask - Integer, each bit of which is used to set a mask.
int getViewportMask ( ) const#
Returns the current bit mask for rendering into the viewport. Object surfaces, materials, decals, lights and GUI objects will be rendered into the viewport only if their viewport mask matches the camera's one (one matching bit is enough).Return value
Integer, each bit of which is used to set a mask.void setZFar ( float zfar ) #
Sets a distance to the far clipping plane of the camera's viewing frustum and updates the projection matrix.Arguments
- float zfar - New distance in units. If a negative value is provided, 0 will be used instead.
float getZFar ( ) const#
Returns the current distance to the far clipping plane of the camera's viewing frustum.Return value
Distance in units.void setZNear ( float znear ) #
Sets a distance to the near clipping plane of the camera's viewing frustum and updates the projection matrix.Arguments
- float znear - New distance in units. If a negative value is provided, 0 will be used instead.
float getZNear ( ) const#
Returns the current distance to the near clipping plane of the camera's viewing frustum.Return value
Distance in units.Ptr<Camera> clone ( ) const#
Clones the current camera and saves it to the given camera instance.Return value
Copy of the camera.void setFovMode ( Camera::FOV_MODE mode ) #
Sets the value indicating the type of FOV that is used for the camera:- For the classic camera, the vertical FOV should be set. In this case, FOV is directly set in degrees.
- For the physically-based camera, the horizontal FOV should be set. In this case, FOV is calculated depending on the film gate and focal length of the camera.
Arguments
- Camera::FOV_MODE mode - FOV_MODE_VERTICAL for the camera with the vertical FOV; FOV_MODE_PHYSICALLY_BASED_CAMERA for the physically-based camera with the horizontal FOV.
Camera::FOV_MODE getFovMode ( ) const#
Sets the value indicating the type of FOV that is used for the camera.Return value
0 if the camera with the vertical FOV is used; 1 if the physically-based camera with the horizontal FOV is used.void setFilmGate ( float gate ) #
Sets a film gate for the physically-based camera with horizontal FOV.Arguments
- float gate - Film gate.
float getFilmGate ( ) const#
Returns a film gate for the physically-based camera with horizontal FOV.Return value
Film gate.void setFocalLength ( float length ) #
Sets a focal length of the physically-based camera lens.Arguments
- float length - Camera lens focal length.
float getFocalLength ( ) const#
Returns the focal length of the physically-based camera lens.Return value
Camera lens focal length.Math::mat4 getAspectCorrectedProjection ( float aspect ) const#
Returns projection matrix after correction for the specified aspect ratio. Currently fixed FOV component is taken into account.Arguments
- float aspect - Aspect ratio.
Return value
Projection matrix after correction for the specified aspect ratio.Camera::FOV_FIXED getFovFixed ( ) const#
Returns a value indicating which FOV component (horizontal or vertical) is currently fixed.Return value
Current fixed FOV component, one of the FOV_FIXED_* values.void addScriptableMaterial ( const Ptr<Material> & material ) #
Attaches a new scriptable material to the camera. To apply a scriptable material globally, use the addScriptableMaterial() method of the Render class. The order of execution for scripts assigned to scriptable materials is defined by material's number in the list of the camera.Notice
Scriptable materials applied globally have their expressions executed before the ones that are applied per-camera.
Arguments
void insertScriptableMaterial ( int num, const Ptr<Material> & material ) #
Inserts a new scriptable material into the list of the ones assigned to the camera. To apply a scriptable material globally, use the insertScriptableMaterial() method of the Render class. The order of execution for scripts assigned to scriptable materials is defined by material's number in the camera's list.Notice
Scriptable materials applied globally have their expressions executed before the ones that are applied per-camera.
Arguments
- int num - Position at which a new scriptable material is to be inserted.
- const Ptr<Material> & material - Scriptable material to be inserted.
void removeScriptableMaterial ( int num ) #
Removes the scriptable material with the specified number from the camera.Arguments
- int num - Scriptable material number in the range from 0 to the total number of scriptable materials.
int getNumScriptableMaterials ( ) const#
Returns the total number of scriptable materials attached to the camera.Return value
Total number of scriptable materials attached to the camera.int findScriptableMaterial ( const Ptr<Material> & material ) const#
Returns the number of the specified scriptable material for the camera. This number is camera-specific (valid for this camera only) and determines the order in which the assigned expressions are executed.Notice
Scriptable materials applied globally have their expressions executed before the ones that are applied per-camera.
Arguments
Return value
Scriptable material number in the range from 0 to the total number of scriptable materials, or -1 if the specified material was not found.void setScriptableMaterial ( int num, const Ptr<Material> & material ) #
Replaces the scriptable material with the specified number with the new scriptable material specified. The number of material determines the order in which the expressions assigned to it are executed. This number is camera-specific (valid for this camera only).Notice
Scriptable materials applied globally have their expressions executed before the ones that are applied per-camera.
Arguments
- int num - Scriptable material number in the range from 0 to the total number of scriptable materials.
- const Ptr<Material> & material - New scriptable material to replace the one with the specified number.
Ptr<Material> getScriptableMaterial ( int num ) const#
Returns a scriptable material attached to the camera by its number.Arguments
- int num - Scriptable material number in the range from 0 to the total number of scriptable materials.
Return value
Scriptable material attached to the camera with the specified number.void setScriptableMaterialEnabled ( int num, bool enabled ) #
Enables or disables the scriptable material with the specified number. When a material is disabled (inactive), the scripts attached to it are not executed.Arguments
- int num - Scriptable material number in the range from 0 to the total number of scriptable materials.
- bool enabled - 1 to enable the scriptable material with the specified number, 0 to disable it.
bool getScriptableMaterialEnabled ( int num ) const#
Returns a value indicating if the scriptable material with the specified number attached to the camera is enabled (active). When a material is disabled (inactive), the scripts attached to it are not executed.Arguments
- int num - Scriptable material number in the range from 0 to the total number of scriptable materials.
Return value
1 if the scriptable material with the specified number is enabled; otherwise, 0.void swapScriptableMaterials ( int num_0, int num_1 ) #
Swaps two scriptable materials with specified numbers. The number of material determines the order in which the expressions assigned to it are executed.Notice
The number is camera-specific (valid for this camera only).
Arguments
- int num_0 - Number of the first scriptable material in the range from 0 to the total number of scriptable materials.
- int num_1 - Number of the second scriptable material in the range from 0 to the total number of scriptable materials.
void clearScriptableMaterials ( ) #
Clears all scriptable materials attached to the camera.Ptr<Camera> copy ( const Ptr<Camera> & camera ) const#
Copies the parameters from the source camera to this camera instance.Arguments
- const Ptr<Camera> & camera - Smart pointer to the source camera.
Return value
Smart pointer to this camera.void swap ( const Ptr<Camera> & camera ) #
Swaps the parameters between the specified camera and this camera instance.Arguments
- const Ptr<Camera> & camera - Camera smart pointer.
void setProjectionMode ( Camera::PROJECTION_MODE mode ) #
Sets the projection mode: orthographic or perspective.Arguments
- Camera::PROJECTION_MODE mode - The projection mode, PROJECTION_MODE_ORTHOGRAPHIC for the orthographic mode; PROJECTION_MODE_PERSPECTIVE for the perspective mode.
Camera::PROJECTION_MODE getProjectionMode ( ) const#
Returns the current projection mode: orthographic or perspective.Return value
The projection mode, PROJECTION_MODE_ORTHOGRAPHIC for the orthographic mode; PROJECTION_MODE_PERSPECTIVE for the perspective mode.void setOrthoHeight ( float height ) #
Sets the height of the camera with the orthographic projection mode enabled.Arguments
- float height - The orthographic camera height.
float getOrthoHeight ( ) const#
Returns the current height of the camera with the orthographic projection mode enabled.Return value
The orthographic camera height.Last update:
2024-08-16
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