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[rmodels] Add comments to DrawBillboardPro

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This commit is contained in:
coco24 2024-07-07 16:43:38 +08:00
parent 91e19d4c42
commit 7f89b40a85
1 changed files with 16 additions and 0 deletions
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16
src/rmodels.c
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@ -3661,11 +3661,13 @@ void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector
// NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width // NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width
size = (Vector2) { size.x*fabsf((float)source.width/source.height), size.y }; size = (Vector2) { size.x*fabsf((float)source.width/source.height), size.y };
// Compute the up vector and the right vector
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up); Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
Vector3 right = { matView.m0, matView.m4, matView.m8 }; Vector3 right = { matView.m0, matView.m4, matView.m8 };
right = Vector3Scale(right, size.x); right = Vector3Scale(right, size.x);
up = Vector3Scale(up, size.y); up = Vector3Scale(up, size.y);
// Flip the content of the billboard while maintaining the counterclockwise edge rendering order
if (size.x < 0.0f) if (size.x < 0.0f)
{ {
source.x += size.x; source.x += size.x;
@ -3681,9 +3683,23 @@ void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector
origin.y *= -1.0f; origin.y *= -1.0f;
} }
// Assume the given origin is normalized and does not alter the position of the billboard
position = Vector3Add(position, Vector3Scale(Vector3Add(Vector3Scale(right, origin.x), Vector3Scale(up, origin.y)), 0.5f)); position = Vector3Add(position, Vector3Scale(Vector3Add(Vector3Scale(right, origin.x), Vector3Scale(up, origin.y)), 0.5f));
origin = Vector2Multiply(Vector2Scale(Vector2Add(origin, Vector2One()), 0.5f), (Vector2) { fabsf(size.x), fabsf(size.y) }); origin = Vector2Multiply(Vector2Scale(Vector2Add(origin, Vector2One()), 0.5f), (Vector2) { fabsf(size.x), fabsf(size.y) });
// Draw the texture region described by source on the following rectangle in 3D space:
//
// size.x <--.
// 3 ^---------------------------+ 2 \ rotation
// | | /
// | |
// | origin.x position |
// up |.............. | size.y
// | . |
// | . origin.y |
// | . |
// 0 +---------------------------> 1
// right
Vector3 forward; Vector3 forward;
if (rotation != 0.0) forward = Vector3CrossProduct(right, up); if (rotation != 0.0) forward = Vector3CrossProduct(right, up);