This class holds a variety of static math functions that are useful to have defined with creating graphics programs.
Definition at line 28 of file gfxmath.h.
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| static float | Clamp (float x, float a, float b) |
| | Returns a if x is less than a and b if x is greater than b. More...
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| static float | ToRadians (float degrees) |
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| static float | ToDegrees (float radians) |
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| static Vector3 | ToRadians (Vector3 degrees) |
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| static Vector3 | ToDegrees (Vector3 radians) |
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| static float | Lerp (float a, float b, float alpha) |
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| static int | iLerp (int a, int b, float alpha) |
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| static Point3 | ScreenToNearPlane (const Matrix4 &viewMatrix, const Matrix4 &projMatrix, const Point2 &normalizedScreenPt) |
| | Converts a 2D point on the filmplane represented in Normalized Device Coorindates, which means (-1,1) for the top left corner of the screen and (1,-1) for the bottom right corner, to a 3D point that lies on the camera's near plane. Useful for converting mouse coordinates into a 3D point. Remember that this uses NORMALIZED device coordinates for the screenPt, not pixels. GraphicsApp and most other graphics engines report mouse move events in pixels, so you need to convert these to normalized device coordinates first. If you are using GraphicsApp, you can do this with: Point2 normPos = graphicsApp->pixels_to_normalized_coordinates(mousePos);. More...
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| static Point3 | ScreenToDepthPlane (const Matrix4 &viewMatrix, const Matrix4 &projMatrix, const Point2 &normalizedScreenPt, float planeDepth) |
| | Similar to filmplane2D_to_nearplane3D() but here rather than using the nearplane, you specify the depth of the plane to use as a distance away from the camera's focal point. More...
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| static Point3 | ScreenToWorld (const Matrix4 &viewMatrix, const Matrix4 &projMatrix, const Point2 &normalizedScreenPt, float normalizedZ) |
| | Converts a 2D point on the filmplane represented in Normalized Device Coorindates, which means (-1,1) for the top left corner of the screen and (1,-1) for the bottom right corner, to a 3D point in the world. The depth buffer value under the pixel must be supplied. If you are using GraphicsApp, you can use the mouse pos in pixels to get the required arguments like this: Point2 normPos = graphicsApp->pixels_to_normalized_coordinates(mousePos); float normZ = graphicsApp->z_value_at_pixel(mousePos);. More...
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| static Point3 mingfx::GfxMath::ScreenToNearPlane |
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const Matrix4 & |
viewMatrix, |
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const Matrix4 & |
projMatrix, |
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const Point2 & |
normalizedScreenPt |
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Converts a 2D point on the filmplane represented in Normalized Device Coorindates, which means (-1,1) for the top left corner of the screen and (1,-1) for the bottom right corner, to a 3D point that lies on the camera's near plane. Useful for converting mouse coordinates into a 3D point. Remember that this uses NORMALIZED device coordinates for the screenPt, not pixels. GraphicsApp and most other graphics engines report mouse move events in pixels, so you need to convert these to normalized device coordinates first. If you are using GraphicsApp, you can do this with: Point2 normPos = graphicsApp->pixels_to_normalized_coordinates(mousePos);.
